TPO-42 阅读文本和对应题目文本第3篇

合集下载

2019年托福写作：TPO42综合写作阅读题目

2019年托福写作：TPO42综合写作阅读题目TPO42综合写作题目文本Integrated WritingGlass is a favored building material for modern architecture, yet it is also very dangerous for wild birds. Because they often cannot distinguish between glass and open air, millions of birds are harmed every year when they try to fly through glass windows. There are, however, several solutions that responsible businesses can use to prevent injuries to birds.One-Way GlassOne solution is to replace the regular, clear glass with one-way glass that is transparent in only one direction. The occupants of the building can see out, but birds and others cannot see in. If birds cannot see through a window, theywill understand that the glass forms a solid barrier and will not try to fly through it.Colorful DesignsA second solution is to paint colorful lines or other designs on regular window glass. For example, a window could have a design of thin stripes painted over the glass. People would still be able to see through the openings in the design where there is no paint, while birds would see the stripes and thus avoid trying to fly through the glass. Architects can be encouraged to include colorful painted patterns on glass as part of the general design of buildings.Magnetic FieldThe third solution is to create an artificial magnetic field to guide birds away from buildings. Humans use an instrument called a magnetic compass to determine directions—either north, south, east, or west. Bird research has shown that birds have a natural ability to sense Earth’s magnetic fields; this ability works just like a compass, and it helps birds navigate in the right direction when they fly.A building in a bird flight path can be equipped with powerful electromagnets that emit magnetic signals that steer birds in a direction away from the building.TPO42综合写作DirectionsYou have 20 minutes to plan and write your response. Your response will be judged on the basis of the quality of your writing and on how well your response presents the points in the lecture and their relationship to the reading passage. Typically, an effective response will be 150 to 225 words.TPO42综合写作Essay TopicSummarize the points made in the lecture, being sure to explain how they cast doubt on the specific solutions proposed in the reading passage.You must finish your answer in 20 minutes。

TPO 42 托福独立写作

When it comes to the question that whether a worker like to have different types of tasks a day or to do some similar task for the whole day, there is always some heat debates among the public. Some people may claim that doing different types of works is more attractive because they are less likely to get tired off if they could switch their focus for one task to another. However, as for me, I would like to only focus on similar tasks for the all day. My reasons are listed below.First of all, focusing on similar tasks could help me to do some work repeatedly and spare your time and effort on (一些特定的技巧)（要把原因讲一下）sharpen some particular professional skill and thus be more specialized in some field. Under such circumstances, I could significantly enhance my working efficiency. Take myself as an example. 用艺术/科技方面来举例（例子要将原因）Under such circumstances, I gradually become the expert in this particular field and quickly get promoted as the director specialized in Bank Account in the company. Therefore, it is of great importance to focus on a particular task, which helps you to get improved effectively.（影响，你可能在这个专业就很厉害）（概述要论点的原因和影响都要写，例子也是。

TPO-41 阅读文本和对应题目文本第3篇

Trade and Early State FormationBartering was a basic trade mechanism for many thousands of years; often sporadic and usually based on notions of reciprocity, it involved the mutual exchange of commodities or objects between individuals or groups. Redistribution of these goods through society lay in the hands of chiefs, religious leaders, or kin groups. Such redistribution was a basic element in chiefdoms. The change from redistribution to formal trade—often based on regulated commerce that perhaps involved fixed prices and even currency—was closely tied to growing political and social complexity and hence to the development of the state in the ancient world.In the 1970s, a number of archaeologists gave trade a primary role in the rise of ancient states. British archaeologist Colin Renfrew attributed the dramatic flowering of the Minoan civilization on Crete and through the Aegean to intensified trading contacts and to the impact of olive and vine cultivation on local communities. As agricultural economies became more diversified and local food supplies could be purchased both locally and over longer distances, a far-reaching economic interdependence resulted. Eventually, this led to redistribution systems for luxuries and basic commodities, systems that were organized and controlled by Minoan rulers from their palaces. As time went on, the self-sufficiency of communities was replaced by mutual dependence. Interest in long-distance trade brought about some cultural homogeneity from trade and gift exchange, and perhaps even led to piracy. Thus, intensified trade and interaction, and the flowering of specialist crafts, in a complex process of positive feedback, led to much more complex societies based on palaces, which were the economic hubs of a new Minoan civilization.Renfrew’s model made some assumptions that are now discounted. For example, he argued that the introduction of domesticated vines and olives allowed a substantial expansion of land under cultivation and helped to power the emergence of complex society. Many archaeologists and paleobotanists now question this view, pointing out that the available evidence for cultivated vines and olives suggests that they were present only in the later Bronze Age. Trade, nevertheless, was probably one of many variables that led to the emergence of palace economies in Minoan Crete.American archaeologist William Rathje developed a hypothesis that considered an explosion in long-distance exchange a fundamental cause of Mayan civilization in Mesoamerica. He suggested that the lowland Mayan environment was deficient in many vital resources, among them obsidian, salt, stone for grinding maize, and many luxury materials. All these could be obtained from the nearby highlands, from the Valley of Mexico, and from other regions, if the necessary trading networks came into being. Such connections, and the trading expeditions to maintain them, could not be organized by individual villages. The Maya lived in a relatively uniform environment, where every community suffered from the same resource deficiencies. Thus, argued Rathje, long--distance trade networks were organized through local ceremonial centers and their leaders. In time, this organization became a state, and knowledge of its functioning was exportable, as were pottery, tropical bird feathers, specialized stone materials, and other local commodities.Rathje’s hypothesis probably explains part of the complex process of Mayan state formation, but it suffers from the objection that suitable alternative raw materials can be found in the lowlands. It could be, too, that warfare became a competitive response to population growth and to the increasing scarcity of prime agricultural land, and that it played an important role in the emergence of the Mayan states.Now that we know much more about ancient exchange and commerce, we know that, becauseno one aspect of trade was an overriding cause of cultural change or evolution in commercial practices, trade can never be looked on as a unifying factor or as a primary agent of ancient civilization. Many ever-changing variables affected ancient trade, among them the demand for goods. There were also the logistics of transportation, the extent of the trading network, and the social and political environment. Intricate market networks channeled supplies along well-defined routes. Authorities at both ends might regulate the profits fed back to the source, providing the incentive for further transactions. There may or may not have been a market organization. Extensive long-distance trade was a consequence rather than a cause of complex societies.Paragraph 1Bartering was a basic trade mechanism for many thousands of years; often sporadic and usually based on notions of reciprocity, it involved the mutual exchange of commodities or objects between individuals or groups. Redistribution of these goods through society lay in the hands of chiefs, religious leaders, or kin groups. Such redistribution was a basic element in chiefdoms. The change from redistribution to formal trade—often based on regulated commerce that perhaps involved fixed prices and even currency—was closely tied to growing political and social complexity and hence to the development of the state in the ancient world.1.The word "notions" in the passage is closest in meaning toA.ideasB.rulesC.degreesD.traditions2.According to paragraph 1, what development occurred as political and social complexityincreased?A.The prices of most commodities rose.B.Formal trade emerged.C. Chiefs became more powerfulD. Bartering became the preferred means of trade.Paragraph 2In the 1970s, a number of archaeologists gave trade a primary role in the rise of ancient states. British archaeologist Colin Renfrew attributed the dramatic flowering of the Minoan civilization on Crete and through the Aegean to intensified trading contacts and to the impact of olive and vinecultivation on local communities. As agricultural economies became more diversified and local food supplies could be purchased both locally and over longer distances, a far-reaching economic interdependence resulted. Eventually, this led to redistribution systems for luxuries and basic commodities, systems that were organized and controlled by Minoan rulers from their palaces. As time went on, the self-sufficiency of communities was replaced by mutual dependence. Interest in long-distance trade brought about some cultural homogeneity from trade and gift exchange, and perhaps even led to piracy. Thus, intensified trade and interaction, and the flowering of specialist crafts, in a complex process of positive feedback, led to much more complex societies based on palaces, which were the economic hubs of a new Minoan civilization.3.The word “diversified” in the passage is closest in meaning toanizedB.selectiveC.variedD.efficient4. According to paragraph 2, which of the following controlled the systems of redistribution of goods in ancient Crete?A. Local community leadersB.Olive growersC.Minoan rulersD. Long-distance traders5.According to paragraph 2, Renfrew believed that one effect of long-distance trade in the Aegean wasA. a greater effort to control piracyB. greater cultural similarity throughout the regionC. a decline in local olive productionD. a decline in the use of luxuries for gift exchangesParagraph 3Re nfrew’s model made some assumptions that are now discounted. For example, he argued that the introduction of domesticated vines and olives allowed a substantial expansion of land under cultivation and helped to power the emergence of complex society. Many archaeologists and paleobotanists now question this view, pointing out that the available evidence for cultivated vines and olives suggests that they were present only in the later Bronze Age. Trade, nevertheless, was probably one of many variables that led to the emergence of palace economies in Minoan Crete.6. According to paragraph 3, what was a major problem with Renfrew’s model?A.He overlooked the fact that only the Minoan palaces had access to domesticated vines and olives.B.He wrongly assumed that the introduction of domesticated vines and olives led to the cultivation of more land.C. Trade in domesticated plants was much more important to the emergence of Minoan palace economies than he thought.D. Domesticated vines and olives do not appear to have been available as early as he thoughtParagraph 4American archaeologist William Rathje developed a hypothesis that considered an explosion in long-distance exchange a fundamental cause of Mayan civilization in Mesoamerica. He suggested that the lowland Mayan environment was deficient in many vital resources, among them obsidian, salt, stone for grinding maize, and many luxury materials. All these could be obtained from the nearby highlands, from the Valley of Mexico, and from other regions, if the necessary trading networks came into being. Such connections, and the trading expeditions to maintain them, could not be organized by individual villages. The Maya lived in a relatively uniform environment, where every community suffered from the same resource deficiencies. Thus, argued Rathje, long--distance trade networks were organized through local ceremonial centers and their leaders. In time, this organization became a state, and knowledge of its functioning was exportable, as were pottery, tropical bird feathers, specialized stone materials, and other local commodities.7. According to paragraph 4, which of the following was true about ancient Mayan communities?A.They each created their own separate trading networks with communities in the nearby highlands.B.They all had many luxury materials that they were able to trade for resources that they lacked.C. They all needed to obtain a number of important materials through trade with other regions.D.They all gradually reduced their trading activities with communities in the Valley of Mexico and developed trading networks with other regions.8. What can be inferred from the fact that the Maya lived in a “relatively uniform environmen t”?A.The communities could not obtain resources they lacked by trading with each other.B.The communities’ ceremonial centers were all organized in much the same way.C. Increased competition between the communities to export their local commodities expanded commercial networks beyond the nearby highlands.D.Different communities tended to specialize in the production of different commodities.Paragraph 5Rathje’s hypothesis probably explains part of the complex process of Mayan state formation, but it suffers from the objection that suitable alternative raw materials can be found in the lowlands. It could be, too, that warfare became a competitive response to population growth and to the increasing scarcity of prime agricultural land, and that it played an important role in the emergence of the Mayan states.Paragraph 4American archaeologist William Rathje developed a hypothesis that considered an explosion in long-distance exchange a fundamental cause of Mayan civilization in Mesoamerica. He suggested that the lowland Mayan environment was deficient in many vital resources, among them obsidian, salt, stone for grinding maize, and many luxury materials. All these could be obtained from the nearby highlands, from the Valley of Mexico, and from other regions, if the necessary trading networks came into being. Such connections, and the trading expeditions to maintain them, could not be organized by individual villages. The Maya lived in a relatively uniform environment, where every community suffered from the same resource deficiencies. Thus, argued Rathje, long--distance trade networks were organized through local ceremonial centers and their leaders. In time, this organization became a state, and knowledge of its functioning was exportable, as were pottery, tropical bird feathers, specialized stone materials, and other local commodities.9. The word “prime” in the passage is closest in meaning toA. low-lyingB. easily accessibleC. unusedD. high-quality10. What is the role of paragraph 5 in relation to paragraph 4?A. It restates the hypothesis presented in paragraph 4 and reinforces it with further evidence.B. It presents evidence that the hypothesis discussed in paragraph 4 confuses cause and effect.C. It presents a critical assessment of the hypothesis presented in paragraph 4.D. It explains how the hypothesis discussed in paragraph 4 was initially formulated.Paragraph 6Now that we know much more about ancient exchange and commerce, we know that, because no one aspect of trade was an overriding cause of cultural change or evolution in commercial practices, trade can never be looked on as a unifying factor or as a primary agent of ancient civilization. Many ever-changing variables affected ancient trade, among them the demand for goods.There were also the logistics of transportation, the extent of the trading network, and the social and political environment.Intricate market networks channeled supplies along well-defined routes. Authorities at both ends might regulate the profits fed back to the source, providing the incentive for further transactions. There may or may not have been a market organization. Extensive long-distance trade was a consequence rather than a cause of complex societies.11. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. We now know that ancient trade cannot be considered a main factor in the rise of civilization, because no one aspect of it caused change in culture or commercial practices.B. We now know that the growth of civilization was an important factor in causing cultural change and in improving commercial practices.C.We now know much more about how ancient trade and commerce led to cultural changes and the evolution of commercial practices.D.We now know much more about the main factors and agents that led to ancient civilization, because we know what aspects of trade affected culture and commercial practices.12. According to paragraph 6, all of the following statements about trade in ancient civilizations are true EXCEPT:A. The spread of trade was influenced by many variables, none of which was the main cause.B. Political conditions were more important than demand for goods in the development of trade.C.Some markets had clearly established trading routes.D. The regulation of profits provided incentives for future trade.13.Look at the four squares [■] that indicate where the following sentence could be added to the passage.But demand for locally unobtainable resources was clearly only a part of the story.Where would the sentence best fit? Click on a square [■] to add the sentence to the passage.Now that we know much more about ancient exchange and commerce, we know that, because no one aspect of trade was an overriding cause of cultural change or evolution in commercial practices, trade can never be looked on as a unifying factor or as a primary agent of ancient civilization. [■] Many ever-changing variables affected ancient trade, among them the demand for goods.[■] There were also the logistics of transportation, the extent of the trading network, and the social and political environment.[■] Intricate market networks channeled supplies along well-defined routes.[■] Authorities at both ends might regulate the profits fed back to the source, providing the incentive for further transactions. There may or may not have been a market organization. Extensive long-distance trade was a consequence rather than a cause of complex societies.14.Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.Drag your answer choices to the spaces where they belong. To remove an answer choice, click on it.To review the passage, click VIEW TEXT.Various attempts have been made to explore the role that trade played in the rise of ancient states.Answer ChoicesA. Barter, a basic trade mechanism that involved the direct exchange of goods or services, depended on a high degree of social complexity.B. It was only in the 1970s that most archaeologists began to realize that the long-distance trade typical of Minoan communities varied significantly from that of lowland Mayan communities.C. Renfrew and Rathje are recognized today for having correctly analyzed the basic relationship between trade and the emergence of states, even though they were wrong about many details.D. Renfrew suggested that an organized state emerged in Minoan Crete because of intensified trade,but current views indicate that trade was probably only one of many variables.E. Rathje's hypothesis that long-distance trade led to the emergence of a Mayan state has been objected to, and it is argued that other factors such as warfare may have played an important role too.F. Current views indicate that trade was not the most important agent of ancient civilization and that long-distance trade was a result rather than a cause of complex societies.。

托福TPO4阅读文本及题目答案Part3整理

托福TPO4阅读文本及题目答案Part3整理托福TPO是我们托福阅读的重要参考资料，为了便利大家备考，下面我给大家整理了托福TPO4阅读文本及题目答案Part3，盼望大家喜爱。

托福TPO4阅读真题原文Part3Petroleum ResourcesPetroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment. Microscopic organisms settle to the seafloor and accumulate in marine mud. The organic matter may partially decompose, using up the dissolved oxygen in the sediment. As soon as the oxygen is gone, decay stops and the remaining organic matter is preserved.Continued sedimentation-the process of deposits settling on the sea bottom-buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas. As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby. Over long periods of time (millions of years), accumulations of gas and oil can collect in the sandy layers. Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.Oil pools are valuable underground accumulations of oil, and oil fields are regions underlain by one or more oil pools. When an oil pool or field has been discovered, wells are drilled into the ground. Permanent towers, called derricks, used to be built to handle the long sections ofdrilling pipe. Now portable drilling machines are set up and are then dismantled and removed. When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it. Although this rise of oil is almost always carefully controlled today, spouts of oil, or gushers, were common in the past. Gas pressure gradually dies out, and oil is pumped from the well. Water or steam may be pumped down adjacent wells to help push the oil out. At a refinery, the crude oil from underground is separated into natural gas, gasoline, kerosene, and various oils. Petrochemicals such as dyes, fertilizer, and plastic are also manufactured from the petroleum.As oil becomes increasingly difficult to find, the search for it is extended into more-hostile environments. The development of the oil field on the North Slope of Alaska and the construction of the Alaska pipeline are examples of the great expense and difficulty involved in new oil discoveries. Offshore drilling platforms extend the search for oil to the oceans continental shelves-those gently sloping submarine regions at the edges of the continents. More than one-quarter of the worlds oil and almost one-fifth of the worlds natural gas come from offshore, even though offshore drilling is six to seven times more expensive than drilling on land. A significant part of this oil and gas comes from under the North Sea between Great Britain and Norway.Of course, there is far more oil underground than can be recovered. It may be in a pool too small or too far from a potential market to justify the expense of drilling. Some oil lies under regions where drilling is forbidden, such as national parks or other public lands. Even given the best extraction techniques, only about 30 to 40 percent of the oil in a given pool can be brought to the surface. The rest is far too difficult to extract and has to remain underground.Moreover, getting petroleum out of the ground and from under the sea and to the consumer can create environmental problems anywhere along the line. Pipelines carrying oil can be broken by faults or landslides, causing serious oil spills. Spillage from huge oil-carrying cargo ships, called tankers, involved in collisions or accidental groundings (such as the one off Alaska in 1989) can create oil slicks at sea. Offshore platforms may also lose oil, creating oil slicks that drift ashore and foul the beaches, harming the environment. Sometimes, the ground at an oil field may subside as oil is removed. The Wilmington field near Long Beach, California, has subsided nine meters in 50 years; protective barriers have had to be built to prevent seawater from flooding the area. Finally, the refining and burning of petroleum and its products can cause air pollution. Advancing technology and strict laws, however, are helping control some of these adverse environmental effects.Paragraph 1: Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment. Microscopic organisms settle to the seafloor and accumulatein marine mud. The organic matter may partially decompose, using up the dissolved oxygenin the sediment. As soon as the oxygen is gone, decay stops and the remaining organic matter is preserved.托福TPO4阅读真题题目Part31.The word accumulate in the passage is closest in meaning to○grow up○build up○spread out○break apart2.According to paragraph 1, which of the following is true about petroleum formation?○Microscopic organisms that live in mud produce crude oil and natural gas.○Large amounts of oxygen are needed for petroleum formation to begin.○Petroleum is produced when organic material in sediments combines with decaying marine organisms.○Petroleum formation appears to begin in marine sediments where organic matter is present.Paragraph 1: Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment. Microscopic organisms settle to the seafloor and accumulate in marine mud. The organic matter may partially decompose, using up the dissolved oxygen in the sediment. As soon as the oxygen is gone, decay stops and the remaining organic matter is preserved.Paragraph 2: Continued sedimentation-the process of deposits settling on the sea bottom-buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas. As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandylayers nearby. Over long periods of time (millions of years), accumulations of gas and oil can collect in the sandy layers. Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.3.In paragraphs 1 and 2, the authors primary purpose is to○describe how petroleum is formed○explain why petroleum formation is a slow process○provide evidence that a marine environment is necessary for petroleum formation○show that oil commonly occurs in association with gas4.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.○Higher temperatures and pressures promote sedimentation, which is responsible for petroleum formation.○Deposits of sediments on top of organic matter increase the temperature of and pressure on the matter.○Increase pressure and heat from the weight of the sediment turn the organic remains into petroleum.○The remains of microscopic organisms transform into petroleum once they are buried under mud.Paragraph 3: Oil pools are valuable underground accumulations of oil, and oil fields are regions underlain by one or more oil pools. When an oil pool or field has been discovered, wells are drilled into the ground. Permanent towers, called derricks, used to be built to handle the long sections of drilling pipe. Now portable drilling machines are set up and are then dismantled and removed. When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it. Although this rise of oil is almost always carefully controlled today, spouts of oil, or gushers, were common in the past. Gas pressure gradually dies out, and oil is pumped from the well. Water or steam may be pumped down adjacent wells to help push the oil out. At a refinery, the crude oil from underground is separated into natural gas, gasoline, kerosene, and various oils. Petrochemicals such as dyes, fertilizer, and plastic are also manufactured from the petroleum.5.The word adjacent in the passage is closest in meaning to○nearby○existing○special○deep6.Which of the following can be inferred from paragraph 3 about gushers?○They make bringing the oil to the surface easier.○They signal the presence of huge oil reserves.○They waste more oil than they collect.○They are unlikely to occur nowadays.Paragraph 4: As oil becomes increasingly difficult to find, the search for it is extended into more-hostile environments. The development of the oil field on the North Slope of Alaska and the construction of the Alaska pipeline are examples of the great expense and difficulty involved in new oil discoveries. Offshore drilling platforms extend the search for oil to the oceans continental shelves-those gently sloping submarine regions at the edges of the continents. More than one-quarter of the worlds oil and almost one-fifth of the worlds natural gas come from offshore, even though offshore drilling is six to seven times more expensive than drilling on land. A significant part of this oil and gas comes from under the North Sea between Great Britain and Norway.7.Which of the following strategies for oil exploration is described in paragraph 4?○Drilling under the oceans surface○Limiting drilling to accessible locations○Using highly sophisticated drilling equipment○Constructing technologically advanced drilling platforms8.What does the development of the Alaskan oil field mentioned inparagraph 4 demonstrate?○More oil is extracted from the sea than from land.○Drilling for oil requires major financial investments.○The global demand for oil has increased over the years.○The North Slope of Alaska has substantial amounts of oil.9.The word sloping in the passage is closest in meaning to○shifting○inclining○forming○rollingParagraph 5: Of course, there is far more oil underground than can be recovered. It may be in a pool too small or too far from a potential market to justify the expense of drilling. Some oil lies under regions where drilling is forbidden, such as national parks or other public lands. Even given the best extraction techniques, only about 30 to 40 percent of the oil in a given pool can be brought to the surface. The rest is far too difficult to extract and has to remain underground.10.According to paragraph 5, the decision to drill for oil depends on all of the following factors EXCEPT○permission to access the area where oil has been found○the availability of sufficient quantities of oil in a pool○the location of the market in relation to the drilling site○the political situation in the region where drilling would occurParagraph 6: Moreover, getting petroleum out of the ground and from under the sea and to the consumer can create environmental problems anywhere along the line. Pipelines carrying oil can be broken by faults or landslides, causing serious oil spills. Spillage from hugeoil-carrying cargo ships, called tankers, involved in collisions or accidental groundings (such as the one off Alaska in 1989) can create oil slicks at sea. Offshore platforms may also lose oil, creating oil slicks that drift ashore and foul the beaches, harming the environment. Sometimes, the ground at an oil field may subside as oil is removed. The Wilmington field near Long Beach, California, has subsided nine meters in 50 years; protective barriers have had to be built to prevent seawater from flooding the area. Finally, the refining and burning of petroleum and its products can cause air pollution. Advancing technology and strict laws, however, are helping control some of these adverse environmental effects.11.The word foul in the passage is closest in meaning to○reach○flood○pollute○alter12.In paragraph 6, the authors primary purpose is to○provide examples of how oil exploration can endanger the environment○describe accidents that have occurred when oil activities were in progress○give an analysis of the effects of oil spills on the environment○explain how technology and legislation help reduce oil spillsParagraph 2: Continued sedimentation-the process of deposits settling on the sea bottom-buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas. █As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby. █Over long periods of time (millions of years), accumulations of gas and oil can collect in the sandy layers. █Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment. █13.Look at the four squares [█] that indicate where the following sentence could be added to the passage.Unless something acts to halt this migration, these natural resources will eventually reach the surface.Where would the sentence best fit?14.Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.Petroleum is a broad term that includes both crude oil and natural gas.●●●Answer choices○Petroleum formation is the result of biological as well as chemical activity.○The difficulty of finding adequate sources of oil on land has resulted in a greater number of offshore drilling sites.○Petroleum extraction can have a negative impact on the environment.○Petroleum tends to rise to the surface, since it is lower in density than water.○Current methods of petroleum extraction enable oil producers to recover about half of the worlds petroleum reserves.○Accidents involving oil tankers occur when tankers run into shore reefs or collide with other vessels托福TPO4阅读真题题目答案Part3参考答案：1. ○22. ○43. ○14. ○35. ○16. ○47. ○18. ○29. ○210. ○411. ○312. ○113. ○414. Petroleum formation is the…The difficulty of finding…Petroleum extraction can…托福TPO4阅读真题翻译Part3参考翻译：石油资源石油是由原油和自然气组成，好像都源自于海洋的有机物沉淀。

2019年托福写作：TPO42综合写作阅读题目.doc

2019 年托福写作： TPO42 综合写作阅读题目TPO42综合写作题目文本Integrated WritingGlass is a favored building material for modern architecture, yet it is also very dangerous for wild birds. Because they often cannot distinguish between glass andopen air, millions of birds are harmed every year when they tryto fly through glass windows. There are, however, several solutions that responsible businesses can use to preventinjuries to birds.One-Way GlassOne solution is to replace the regular, clear glass withone-way glass that is transparent in only one direction. The occupants of the building can see out, but birds and others cannot see in. If birds cannot see through a window, theywill understand that the glass forms a solid barrier and willnot try to fly through it.Colorful DesignsA second solution is to paint colorful lines or other designs on regular window glass. For example, a window could have a design of thin stripes painted over the glass. People would stillbe able to see through the openings in the design where thereis no paint, while birds would see the stripesand thus avoid trying to fly through the glass. Architectscan be encouraged to include colorful painted patterns onglass as part of the general design of buildings.Magnetic FieldThe third solution is to create an artificial magneticfield to guide birds away from buildings. Humans use aninstrument called a magnetic compass to determinedirections —either north, south, east, or west. Bird researchhas shown that birds have a natural ability to sense Earth’s magnetic fields; this ability works just like a compass, andit helps birds navigate in the right direction when they fly.A building in a bird flight path can be equipped withpowerful electromagnets that emit magnetic signals that steerbirds in a direction away from the building.DirectionsTPO42综合写作You have 20 minutes to plan and write your response.Your response will be judged on the basis of the quality of yourwriting and on how well your response presents the points in thelecture and their relationship to the reading passage. Typically,an effective response will be 150 to 225 words.Essay TopicTPO42综合写作Summarize the points made in the lecture, being sure toexplain how they cast doubt on the specific solutionsproposed in the reading passage.You must finish your answer in 20 minutes。

TPO阅读42文本答案翻译

TPO-42Geographic Isolation of SpeciesBiologist Ernst Mayr defined a species as “an actually or potentially interbreeding population that does notthe separation of a population with its gene pool (all of the genes in a population at any one time) from other populations of the same species, thereby preventing population interbreeding. With its gene pool isolated, a separate population canbeen a geographic barrier. This mode of evolving new species is called allopatric speciation.Many factors can isolate a population geographically. A mountain range may emerge and gradually split a population of organisms that can inhabit only lowland lakes, certain fish populations might become isolated in this way. Similarly, a creeping glacier may gradually divide a population, or a land bridge such as the Isthmus of Panama may form and separate the marine life in the ocean waters on either side.Too many words you don’t know? Look them up in《新托福TPO阅读词汇速查速记》!Wechat: geeqi0805How formidable must a geographic barrier be to keep populations apart? It depends on the ability of the organisms to move across barriers. Birds and coyotes can easily cross mountains and rivers. The passage of wind-blown tree pollen is also not hindered by such barriers, and the seeds of many plants may be carried back and forth on animals In contrast, small rodents may find a deep canyon or a wide river an effective barrier. For example, the Grand Canyon, in the southwestern United States, separate the range of the while-tailed antelop e squirrel from that of the closely related Harris’ antelope squirrel. Smaller, with a shorter tail that is white underneath, the white-tailed antelope squirrel inhabits deserts north of the canyon and west of the Colorado River in southern California Hams' antelope squirrel has a more limited range in deserts south of the Grand Canyon.Geographic isolation creates opportunities for new species to develop, but it does not necessarily lead to newbetween the isolated population and its parent population. The likelihood of allopatric speciation increases when a population is small as well as isolated, making it more likely than a large population to have its gene pool changed substantially. For example, in less than two million years, small populations of stray animals and plants from the SouthAmerican mainland to colonize the Galapagos Islands gave rise to all the species that now inhabit the islands.When oceanic islands are far enough apart to permit populations to evolve in isolation, but close enough to allow occasional dispersions to occur, they are effectively outdoor laboratories of evolution. The Galapagos island chain is one of the world’s greatest showcases of evolution. Each island was born from underwater volcanoes and was gradually covered by organisms derived from strays that rode the ocean currents and winds from other islands and continents. Organisms can also be carried to islands by other organisms, such as sea birds that travel long distances with seeds clinging to their feathers.The species on the Galapagos Islands today, most of which occur nowhere else, descended from organisms that floated, flew, or were blown over the sea from the South American mainland. For instance, the Galapagos island chainhas a total of thirteen species of closely related birds called Galapagos finches. These birds have many similarities but differ in their feeding habits and their beak type, which is correlated with what they eat. Accumulated evidence indicates that all thirteen finch species evolved from a single small population of ancestral birds that colonized one of the islands. Completely isolated on the island after migrating from the mainland, the founder population may have undergone significant changes in its gene pool and become a new species. ■Later, a few individuals of this new species may have been blown by storms to a neighboring island. ■Isolated on this second island, t he second founder population could have evolved into a second new species, which could later recolonize the island from which its founding population emigrated. ■Today each Galapagos island has multiple species of finches, with as many as ten on some islands. ■A. earlyB. crucialC. noticeableD. frequentA. bestB. usualC. firstD. actualYou enjoy the convenience of having all vocabulary questions listed as a separate part in《新托福TPO阅读词汇速查速记》.3. According to paragraph 1, allopatric speciation is possible whenA. a population contains all the different genes present in a species at a particular timeB. a population becomes isolated due to the presence of a geographic barrierC. genetic mixing begins to occur in previously separate populations of a speciesD. a species is successful in crossing a geographic barrier4. How is paragraph 2 related to paragraph 1?A. Paragraph 2 points out a number of ways in which the phenomenon of geographic isolation mentioned in paragraph 1 can occurB. Paragraph 2 identifies discoveries that led to the conclusion presented in paragraph 1 that geographic isolation has played a role in the origin of many speciesC. Paragraph 2 provides evidence supporting the statement in paragraph 1 that a population can follow its own evolutionary course once its gene pool becomes isolatedD. Paragraph 2 explains why the term “allopatric” was adopted to describe the method of speciation described in paragraph 15. In paragraph 3, the author contrasts a variety of organisms to illustrate which of the following points?A. Geographic barriers are less likely to keep apart populations of plants than populations of animalsB. Geographic barriers are more likely to keep apart populations of large organisms than populations of small organismsC. Some members of a species are able to cross geographic barriers, while other members of the same species are notD. The effectiveness of geographic barriers in keeping organisms apart depends on an organism’s ability to move across barriers6. Paragraph 3 supports the idea that white-tailed antelope squirrels and Hams' antelope squirrels have which of the following in common?A. They are the two smallest rodents now found in the southwestern United States.B. They have white coloring underneath their tailsC. They cannot cross the Grand CanyonD. They cannot survive in desert conditionsA. experiencesB. allowsC. preventsD. causes8. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential informationA. Geographic isolation is sometimes but not always the reason for the creation of reproductive barriers between a parent population and the populations descended from itB. Genetic changes in a geographical isolated population do not necessarily make the population look different enough from its parent population to be considered a new speciesC. Geographical isolation allows the separated populations to evolve independently of each other and so can lead to the formation of new speciesD. Geographic isolation can lead to new species only if the gene pool of the isolated population changes enough to prevent it from reproducing with the parent population9. According to paragraph 4, why does the size of a population affect the likelihood of allopatric speciation?A. Because smaller populations are more likely than larger ones to become geographically isolatedB. Because the gene pool of a small isolated population is more likely to undergo substantial change than is the gene pool of a larger populationC. Because an isolated population can become a new species with substantially less change to its gene pool than would be required by a larger populationD. Because smaller populations are more likely to be made up of stray animals or plants than larger populations areA. were ableB. were forcedC. arrivedD. expanded11. Paragraph 5 supports the idea that the Galapagos island chain was able to become “one of the world's greatest showcases of evolution” primarily because ofA. the richness of the volcanic soil of each of the islands in the chainB. the distance of the individual islands from each other and from the mainlandC. the relativity long time it took for the islands to become covered by organismsD. the outdoor laboratories that scientists have built on the islands to study evolution12. According to paragraph 6, what is true about the thirteen species of Galapagos finches?A. All thirteen species are now found on most of the Galapagos IslandsB. All thirteen species are descended from the same population of ancestral birdsC. All thirteen species evolved on the island that was originally colonized by finches from the mainland.D. All thirteen species occur only in small, completely isolated populations.13. Look at the four squares [█] that indicate where the following sentence could be added to the passageThis process of speciation and colonization could have been repeated over and over again, gradually involving all the islands in the chain.Where would the sentence best fit? Click on a square to add the sentence to the passage.14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. The question is worth 2 points.The geographic isolation of a population can result in the rise of a new species.●●●Answer Choices○ Isolation can result when a geographic barrier forms and splits a population or when a few organisms somehow get carried across an existing geographic barrier and form a new population○ Speciation is more likely when an isolated population is small because significant genetic changes are more likely to occur in a small population than in a large one○ Because of the geographic isolation of the Galapagos Islands, the species that now inhabit them have gene pools that have not changed very much since the islands were first populated.○ Fish populations are more easily isolated by geographic barriers than are populations of most other organisms because fish cannot move across areas where there is no water.○ The Galapagos Islands are well situated for speciation because they provide opportunities for population isolation while also making occasional dispersions between islands possible.○ Evidence indicates t hat the first organisms to reach the Galapagos Islands were probably a small population of finches that, in less than two million years of isolation, evolved into thirteen species.答案：1-5: B C B A D 6-10:C A D B A 11-14: B B C A B EIf you have any questions concerning the texts or answers, feel free to contact Wechat: geeqi0805.If you are tired of looking up TPO words in a dictionary, try《新托福TPO阅读词汇速查速记》!参考译文：物种的地理隔离生物学家厄恩斯特·迈尔将物种定义为“一个可以互相交配或可能互相交配的群体，但这个群体不能与其它生物交配，即便有交配的机会”。

托福TPO42口语Task3阅读文本+听力文本+题目+满分范文

为了帮助大家高效备考托福，为大家带来托福TPO42口语Task3阅读文本+听力文本+题目+满分范文，希望对大家备考有所帮助。

托福TPO42口语Task3阅读文本： No More Evening Classes The administration has announced that starting next fall, the university will stop offering evening classes in many departments. According to a university administrator, the decision was prompted by a steady decline in enrollments in evening classes. "Evening classes are just too small," the administrator said. When asked to explain the decline in enrollments, the administrator pointed to the fact that most evening classes are taught by teaching assistants, who are usually graduate students. “Surveys show that students prefer to take classes taught by experienced faculty members,” the spokesperson said, "probably because they simply know more than graduate teaching assistants do." 托福TPO42口语Task3听力文本： Now listen to two students discussing the article. Man：I just don't know about this decision. Woman：It sort of makes sense to me. Man：Not to me. I don't understand their reasoning. I mean, what's wrong with small classes? I think that's what students actually prefer. And it's easy to see why. Woman：Yeah. You do get to participate more. Man：Definitely. You can be more actively involved, get more attention and support. It's just a better way to learn. Woman：Okay. But there is that survey. Man：I don't know what students they asked, but I know a lot of people who feel just the opposite. I mean, what does experience mean anyway? Sometimes it means you have been teaching the same subject for twenty years and you are probably tired of it by now and maybe not very enthusiastic. Woman：Yeah. That does happen. Man：Whereas if it's the first time or maybe second you are teaching a class,well, it's going to be more exciting to you. And you are going to communicate that excitement to the people you are teaching. At least that's how I see it. 托福TPO42口语Task3题目： The man disagrees with the decision announced in the student newspaper. Explain why the university made the decision and why the man disagrees with it. 托福TPO42口语Task3满分范文： The school has implemented a new policy that the university will stop offering evening classes in many departments starting next fall due to the small scale of them and the unexperienced teaching staff. And the man holds a negative view towards the announcement. The first reason he gives is that thanks to the small classes, students can participate more and be more actively involved, get more attention and learn more. And the second one is based on the fact that some experienced teachers are lack of enthusiasm because they may have been teaching the same subject for too long. In contrast, if this is their first or second time teaching a class, it’s going to be so exciting to them and they’ll definitely dedicate more. Therefore, he disagrees with that opinion. 以上是给大家整理的托福TPO42口语Task3阅读文本+听力文本+题目+满分范文，希望对你有所帮助!。

托福TPO42阅读文本

托福TPO42阅读文本+题目+答案下载Geographic Isolation of SpeciesBiologist Ernst Mayr defined a species as “an actually or potentially interbreeding population that does not interbreed with other such populations when there is opportunity to do so.”A key event in the o rigin of many species is the separation of a population with its gene pool (all of the genes in a population at any one time) from other populations of the same species, thereby preventing population interbreeding With its gene pool isolated, a separate population can follow its own evolutionary course. In the formation of many species, the initial isolation of a population seems to have been a geographic barrier This mode of evolving new species is called allopatric speciation.Many factors can isolate a population geographically.A mountain range may emerge and gradually split a population of organisms that can inhabit only lowland lakes, certain fish populations might become isolated in this way. Similarity, a creeping glacier may gradually divide a population, or a land bridge such as the Isthmus of Panama may form and separate the marine life in the ocean waters on either side. How formidable must a geographic barrier be to keep populations apart? It depends on the ability of the organisms to move across barriers.Birds and coyotes can easily cross mountains and rivers. The passage of wind-blown tree pollen is also not hindered by such barriers, and the seeds of many plants may be earned back and forth on animals In contrast, small rodents may find a deep canyon or a wide river an effective barrier. For example, the Grand Canyon, in the southwestern United Slates, separate the range of the while-tailed antelope squirrel from that of the closely related Harris’ antelope squirrel. Smaller, with a shorter tail that is white underneath, the white-tailed antelope squirrel inhabits deserts north of the canyon and west of the Colorado River in southern California Hams' antelope squirrel has a more limited range in deserts south of the Grand Canyon.Geographic isolation creates opportunities for new species to develop, but it does not necessarily lead to new species because speciation occurs only when the gene pool undergoes enough changes to establish reproductive barriers between the isolated population and its parent population.The likelihood of allopatricspeciation increases when a population is small as well as isolated, making it more likely than a large population to have its gene pool changed substantially. For example,in less than two million years, small populations of stray animals and plants from the South American mainland that managed to colonize the Galapagos Islands gave rise to all the species that now inhabit the islands.When oceanic islands are far enough apart to permit populations to evolve in isolation, but close enough to allow occasional dispersions to occur, they are effectively outdoor laboratories of evolution.The Galapagos island chain is one of the world s greatest showcases of evolution Each island was born from underwater volcanoes and was gradually covered by organisms derived from strays that rode the ocean currents and winds from other islands and continents. Organisms can also be carried to islands by other organisms, such as sea birds that travel long distances with seeds clinging to their feathers.The species on the Galapagos Islands today, most of which occur nowhere else, descended from organisms that floated, flew, or were blown over the sea from the South American mainland For instance, the Galapagos island chain has a total of thirteen species of closely related birds called Galapagos finches These birds have many similarities but differ in their feeding habits andtheir beak type, which is correlated with what they eat Accumulated evidence indicates that all thirteen finch species evolved from a single small population of ancestral birds that colonized one of the pletely isolated on the island after migrating from the mainland, the founder population may have undergone significant changes in its gene pool and become a new species. Later, a few individuals of this new species may have been blown by storms to a neighboring island. Isolated on this second island, the second founder population could have evolved into a second new species, which could later recolonize the island from which its founding population emigrated.Today each Galapagos island has multiple species of finches, with as many as ten on some islands.paragraph 1Biologist Ernst Mayr defined a species as “an actually or potentially interbreeding population that does not interbreed with other such populations when there isopportunity to do so.” A key event in the origin of many species is the separation of a population with its gene pool (all of the genes in a population at any one time) from other populations of the same species, thereby preventing population interbreeding With its gene pool isolated, a separate population can follow its own evolutionary course. In the formation of many species, the initial isolation of a population seems to have been a geographic barrier This mode of evolving new species is called allopatric speciation.1.The word “key” in the passage is closest in meaning toA.earlyB.crucialC.noticeableD.frequent2.The word “initial” in the passage is closest in meaning toA.bestualC.firstD.actual3.According to paragraph 1. allopatric speciation is possible whenA. a population contains all the different genes present in a species at a particular timeB. a population becomes isolated due to the presence of a geographic barrierC. genetic mixing begins to occur in previously separate populations of a speciesD. a species is successful in crossing a geographic barrierparagraph 1&2Biologist Ernst Mayr defined a species as “an actually or potentially interbreeding population that does not interbreed with other such populations when there is opportunity to do so.”A key event in the origin of many species is the separation of a population with its gene pool (all of the genes in a population at any one time) from other populations of the same species, thereby preventing population interbreeding With its gene pool isolated, a separate population can follow its own evolutionary course. In the formation of many species, the initial isolation of a population seems to have been a geographic barrier This mode of evolving new species is called allopatric speciation.Many factors can isolate a population geographically. A mountain range may emerge and gradually split a population of organisms that can inhabit only lowland lakes, certain fish populations might become isolated in this way. Similarity, a creeping glacier may gradually dividea population, or a land bridge such as the Isthmus of Panama may form and separate the marine life in the ocean waters on either side.4.How is paragraph 2 related to paragraph 1?A. Paragraph 2 points out a number of ways in which the phenomenon of geographic isolation mentioned in paragraph 1 can occurB. Paragraph 2 identifies discoveries that led to the conclusion presented in paragraph 1 that geographic isolation has played a rote in the origin of many speciesC. Paragraph 2 provides evidence supporting the statement in paragraph 1 that a population can follow its own evolutionary course once its gene pool becomes isolatedD. Paragraph 2 explains why the term “allopatric” was adopted to describe the method of speciation described in paragraph 1paragraph 3How formidable must a geographic barrier be to keep populations apart? It depends on the ability of the organisms to move across barriers. Birds and coyotes can easily cross mountains and rivers. The passage of wind-blown tree pollen is also not hindered by such barriers, and the seeds of many plants may be earned back and forth on animals In contrast, small rodents may find a deep canyon or a wide river an effective barrier. For example, the Grand Canyon, in the southwestern United Slates, separate the range of the while-tailed antelope squirrel from that of the closely related Harris’ antelope squirrel. Smaller, with a shorter tail that is white underneath, the white-tailed antelope squirrel inhabits deserts north of the canyon and west of the Colorado River in southern California Hams' antelope squirrel hasa more limited range in deserts south of the Grand Canyon.5.In paragraph 3, the author contrasts a variety of organisms to illustrate which of the following points?A. Geographic barriers are less likely to keep apart populations of plants than populations of animals.B. Geographic barriers are more likely to keep apart populations of large organisms than populations of small organismsC. Some members of a species are able to cross geographic barriers, while other members of the same species are not.D. The effectiveness of geographic barriers in keeping organisms apart depends on an organism’s ability to mov e across barriers.6.Paragraph 3 supports the idea that white-tailed antelope squirrels and Hams' antelope squirrels have which of the following in common?A. They are the two smallest rodents now found in the southwestern United States.B. They have white coloring underneath their tailsC. They cannot cross the Grand CanyonD. They cannot survive in desert conditionsparagraph 4Geographic isolation creates opportunities for new species to develop, but it does not necessarily lead to new species because speciation occurs only when the gene pool undergoes enough changes to establish reproductive barriers between the isolated population and its parent population. The likelihood of allopatric speciation increases when a population is small as well as isolated, making it more likely than a large population to have its gene pool changed substantially. For example, in less than two million years, small populations of stray animals and plants from the South American mainland that managed to colonize the Galapagos Islands gave rise to all the species that now inhabit the islands.7.The word “undergoes” in the passage is closest in meaning toA.experiencesB.allowsC.preventsD.causes8.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential informationA. Geographic isolation is sometimes but not always the reason for the creation of reproductive barriers between a parent population and the populations descended from itB. Genetic changes in a geographical isolated population do not necessarily make the population look different enough from its parent population to be considered a new speciesC. Geographical isolation allows the separated populations to evolve independently of each other and so can lead to the formation of new speciesD. Geographic isolation can lead to new species only if the gene pool of the isolated population changes enough to prevent it from reproducing with the parent population 9.According to paragraph 4, why does the size of a population affect the likelihood of allopatric speciation?A. Because smaller populations are more likely than larger ones to become geographically isolatedB. Because the gene pool of a small isolated population is more likely to undergo substantial change than is the gene pool of a larger populationC. Because a isolated population can become a new species with substantially less change to its gene pool than would be required by a larger populationD. Because smaller populations are more likely to be made up of stray animals or plants than larger populations are10.The word “managed” in the passage is closest in meaning toA.were ableB.were forcedC.arrivedD.expandedparagraph 5When oceanic islands are far enough apart to permit populations to evolve in isolation, butclose enough to allow occasional dispersions to occur, they are effectively outdoor laboratories of evolution. The Galapagos island chain is one of the world s greatest showcases of evolution Each island was born from underwater volcanoes and was gradually covered by organisms derived from strays that rode the ocean currents and winds from other islands and continents. Organisms can also be carried to islands by other organisms, such as sea birds that travel long distances with seeds clinging to their feathers.11.Paragraph 5 supports the idea that the Galapagos island chain was able to become “one of the world's greatest showcases of evolution” primarily because ofA. the richness of the volcanic soil of each of the islands in the chainB. the distance of the individual islands from each other and from the mainlandC. the relativity long time it took for the islands to become covered by organismsD. the outdoor laboratories that scientists have built on the islands to study evolutionparagraph 6The species on the Galapagos Islands today, most of which occur nowhere else, descended from organisms that floated, flew, or were blown over the sea from the South American mainland For instance, the Galapagos island chain has a total of thirteen species of closely related birds called Galapagos finches These birds have many similarities but differ in their feeding habits and their beak type, which is correlated with what they eat Accumulated evidence indicates that all thirteen finch species evolved from a single small population of ancestral birds that colonized one of the islands. Completely isolated on the island after migrating from the mainland, the founder population may have undergone significant changes in its gene pool and become a new species. Later, a few individuals of this new species may have been blown by storms to a neighboring island. Isolated on this second island, the second founder population could have evolved into a second new species, which could later recolonize the island from which its founding population emigrated. Today each Galapagos island has multiple species of finches, with as many as ten on some islands.12.According to paragraph 6. what is true about the thirteen species of Galapagos finches?A. All thirteen species are now found on most of the Galapagos IslandsB. All thirteen species are descended from the same population of ancestral birdsC. All thirteen species evolved on the island that was originally colonized by finches from the mainland.D. All thirteen species occur only in small, completely isolated populations.13.Look at the four squares [■] that indicate where the following sentence could be added to the passage.This process of speciation and colonization could have been repeated over and over again, gradually involving all the islands in the chain.The species on the Galapagos Islands today, most of which occur nowhere else, descended from organisms that floated, flew, or were blown over the sea from the South American mainland For instance, the Galapagos island chain has a total of thirteen species of closely related birds called Galapagos finches These birds have many similarities but differ in their feeding habits and their beak type, which iscorrelated with what they eat Accumulated evidence indicates that all thirteen finch species evolved from a single small population of ancestral birds that colonized one of the pletely isolated on the island after migrating from the mainland, the founder population may have undergone significant changes in its gene pool and become a new species. [■] Later, a few individuals of this new species may have been blown by storms to a neighboring island. [■]Isolated on this second island, the second founder population could have evolved into a second new species, which could later recolonize the island from which its founding population emigrated.[■]Today each Galapagos island has multiple species of finches, with as many as ten on some islands.[■]14.Directions：An introductory sentence for a brief summary of the passage is provided plete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage.The geographic isolation of a population can result in the rise of a new species. Answer ChoicesA.Isolation can result when a geographic barrier forms and splits a population or when a few organisms somehow get carried across an existing geographic barrier and form a new populationB.Speciation is more likely when an isolated population is small because significant genetic changes are more likely to occur in a small population than in a large oneC.Because of the geographic isolation of the Galapagos Islands, the species that now inhabit them have gene pools that have not changed very much since the islands were first populated.D.Fish populations are more easily isolated by geographic barriers than are populations of most other organisms because fish cannot move across areas where there is no water.E.The Galapagos Islands are well situated for speciation because they provide opportunities for population isolation while also making occasional dispersions between islands possible.F.Evidence indicates that the first organisms to reach the Galapagos Islands were probably a small population of finches that,in less than two million years of isolation,evolved into thirteen species.Explaining Dinosaur ExtinctionDinosaurs rapidly became extinct about 65 million years ago as part of a mass extinction known as the K-T event, because it is associated with a geological signature known as the K-T boundary, usually a thin band of sedimentation found in various parts of the world (K is the traditional abbreviation for the Cretaceous, derived from the German name Kreidezeit). Many explanations have been proposed for why dinosaurs became extinct. For example, some have blamed dinosaur extinction on the development of flowering plants, which were supposedly more difficult to digest and could have caused constipation or indigestion—except that flowering plants first evolved in the Early Cretaceous, about 60 million years before the dinosaurs died out. In fact, several scientists have suggested that the duckbill dinosaurs and homed dinosaurs, with their complex battery of grinding teeth, evolved to exploit this new resource of rapidly growing flowering plants Others have blamed extinction on competition from the mammals, which allegedly ate all the dinosaur eggs—except that mammals and dinosaurs appeared at the same time in the Late Triassic, about 190 million years ago, and there is no reason to believe that mammals suddenly acquired a taste for dinosaur eggs after 120 million years of coexistence Some explanations (such as the one stating that dinosaurs all died of diseases) fail because there is no way to scientifically test them, and they cannot move beyond the realm of speculation and guesswork.This focus on explaining dinosaur extinction misses an important point the extinction at the end of the Cretaceous was a global event that killed off organisms up and down the food chain. It wiped out many kinds of plankton in the ocean and many marine organisms that lived on the plankton at the base of the food chain. These included a variety of clams and snails, and especially the ammonites, a group of shelled squidlike creatures that dominated the Mesozoic seas and had survived many previous mass extinctions. The K-T event marked the end of the marine reptiles, suchas the mosasaurs and the plesiosaurs, which were the largest creatures that had ever lived in the seas and which ruled the seas long before whales evolved. On land, there was also a crisis among the land plants, in addition to the disappearance of dinosaurs. So any event that can explain the destruction of the base of the food chain (plankton in the ocean, plants on land) can better explain what happened to organisms at the top of the food chain, such as the dinosaurs. By contrast, any explanation that focuses strictly on the dinosaurs completely misses the point The Cretaceous extinctions were a global phenomenon, and dinosaurs were just a part of a bigger picture.According to one theory, the Age of Dinosaurs ended suddenly 65 million years ago when a giant rock from space plummeted to Earth. Estimated to be ten to fifteen kilometers in diameter, this bolide (either a comet or an asteroid) was traveling at cosmic speeds of 20-70 kilometers per second, or 45,000-156,000 miles per hour. Such a huge mass traveling at such tremendous speeds carries an enormous amount of energy. When the bolide struck this energy was released and generated a huge shock wave that leveled everything for thousands of kilometers around the impact and caused most of the landscape to burst into flames. The bolide struck an area of the Yucatan Peninsula of Mexico known as Chicxulub, excavating a crater 15-20 kilometers deep and at least 170 kilometers in diameter. The impact displaced huge volumes of seawater, causing much flood damage in the Caribbean. Meanwhile, the bolide itself excavated 100 cubic kilometers of rock and debris from the site, which rose to an altitude of 100 kilometers. Most of it fell back immediately, but some of it remained as dust in the atmosphere for months. This material, along with the smoke from the fires,shrouded Earth, creating a form of nuclear winter. According to computerized climate models, global temperatures fell to near the freezing point, photosynthesis halted, and most plants on land and in the sea died. With the bottom of the food chain destroyed, dinosaurs could not survive.paragraph 1Dinosaurs rapidly became extinct about 65 million years ago as part of a mass extinction known as the K-T event, because it is associated with a geologicalsignature known as the K-T boundary, usually a thin band of sedimentation found in various parts of the world (K is the traditional abbreviation for the Cretaceous, derived from the German name Kreidezeit). Many explanations have been proposed for why dinosaurs became extinct. For example, some have blamed dinosaur extinction on the development of flowering plants, which were supposedly more difficult to digest and could have caused constipation or indigestion—except that flowering plants first evolved in the Early Cretaceous, about 60 million years before the dinosaurs died out. In fact, several scientists have suggested that the duckbill dinosaurs and homed dinosaurs, with their complex battery of grinding teeth, evolved to exploit this new resource of rapidly growing flowering plants Others have blamed extinction on competition from the mammals, which allegedly ate all the dinosaur eggs—except that mammals and dinosaurs appeared at the same time in the Late Triassic, about 190 million years ago, and there is no reason to believe that mammals suddenly acquired a taste for dinosaur eggs after 120 million years of coexistence Some explanations (such as the one stating that dinosaurs all died of diseases) fail because there is no way to scientifically test them, and they cannot move beyond the realm of speculation and guesswork.1. In paragraph 1, why does the author include a discussion of when flowering plants evolved?A. To help explain why some scientists believe that the development of flowering plants led to dinosaur extinctionB. To cast doubt on the theory that the development of flowering plants caused dinosaurs to become extinctC. To suggest that dinosaurs were able to survive for as long as they did because of the availability of flowering plantsD. To emphasize that duckbill dinosaurs and horned dinosaurs were the first dinosaurs to become extinct2. The word “allegedly” in the passage is closest in meaning toA. inevitablyB. graduallyC. SupposedlyD. Increasingly3. According to paragraph 1 the extinction of the dinosaurs is unlikely to have been the result of competition from mammals becauseA. mammals would not have been capable of eating dinosaur eggsB. mammals did not appear in any significant numbers until after the Late TriassicC. mammals and dinosaurs did not, in fact, compete for any of the same resourcesD. mammals and dinosaurs lived together for roughly 120 million years before the extinctionparagraph 2This focus on explaining dinosaur extinction misses an important point the extinction at the end of the Cretaceous was a global event that killed off organisms up and down the food chain. It wiped out many kinds of plankton in the ocean and many marine organisms that lived on the plankton at the base of the food chain. These included a variety of clams and snails, and especially the ammonites, a group of shelled squidlike creatures that dominated the Mesozoic seas and had survived many previous mass extinctions. The K-T event marked the end of the marine reptiles, such as the mosasaurs and the plesiosaurs, which were the largest creatures that had ever lived in the seas and which ruled the seas long before whales evolved. On land, there was also a crisis among the land plants, in addition to the disappearance of dinosaurs. So any event that can explain the destruction of the base of the food chain (plankton in the ocean, plants on land) can better explain what happened to organisms at the top of the food chain, such as the dinosaurs. By contrast, any explanation that focuses strictly on the dinosaurs completely misses the point The Cretaceous extinctions were a global phenomenon, and dinosaurs were just a part of a bigger picture.paragraph 3According to one theory, the Age of Dinosaurs ended suddenly 65 million years ago when a giant rock from space plummeted to Earth. Estimated to be ten to fifteen kilometers in diameter, this bolide (either a comet or an asteroid) was traveling at cosmic speeds of 20-70 kilometers per second, or 45,000-156,000 miles per hour. Such a huge mass traveling at such tremendous speeds carries an enormous amount ofenergy. When the bolide struck this energy was released and generated a huge shock wave that leveled everything for thousands of kilometers around the impact and caused most of the landscape to burst into flames. The bolide struck an area of the Yucatan Peninsula of Mexico known as Chicxulub, excavating a crater 15-20 kilometers deep and at least 170 kilometers in diameter. The impact displaced huge volumes of seawater, causing much flood damage in the Caribbean. Meanwhile, the bolide itself excavated 100 cubic kilometers of rock and debris from the site, which rose to an altitude of 100 kilometers. Most of it fell back immediately, but some of it remained as dust in the atmosphere for months. This material, along with the smoke from the fires, shrouded Earth, creating a form of nuclear winter. According to computerized climate models, global temperatures fell to near the freezing point, photosynthesis halted, and most plants on land and in the sea died. With the bottom of the food chain destroyed, dinosaurs could not survive.4. According to paragraph 2, what is problematic about some scientists' focus on dinosaur extinction?A. Dinosaurs became extinct so long ago that no theory about their disappearance can be proven scientifically.B. Dinosaurs were not the only organisms that went extinct at the end of the Cretaceous period.C. More marine organisms went extinct during the Cretaceous than did dinosaur species.D. It is more important to understand how plankton and other marine organisms came to thrive during the Cretaceous period.5. According to paragraph 2, each of the following became extinct during the K-T event EXCEPTA. early species of whalesB. marine reptilesC. various species of clamsD. many species of land plants6. What makes the extinction of “the ammonites” especially significant?A. They were among the largest creatures that ever lived.。

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

Callisto and GanymedeFrom 1996 to 1999, the Galileo spacecraft passed through the Jovian system, providing much information about Jupiter's satellites. Callisto, the outermost of Jupiter's four largest satellites, orbits the planet in seventeen days at a distance from Jupiter of two million kilometers. Like our own Moon. Callisto rotates in the same period as it revolves, so it always keeps the same face toward Jupiter. Its noontime surface temperature is only about -140°C, so water ice is stable on its surface year-round. Callisto has a diameter of 4.820 kilometers, almost the same as that of Mercury. Its mass is only one-third as great, which means its density must be only one-third as great as well. This tells us that Callisto has far less of the rocky metallic materials found in the inner planets and must instead be an icy body through much of its interior.Callisto has not fully differentiated, meaning separated into layers of different density materials. Astronomers can tell that it lacks a dense core from the details of its gravitational pull on the Galileo spacecraft during several very close flybys. This fact surprised scientists, who expected that all the big icy moons would be differentiated. It is much easier for an icy body to differentiate than for a rocky one, since the melting temperature of ice is so low. Only a little heating will soften the ice and get the process started, allowing the rock and metal to sink to the center and the slushy ice to float to the surface. Y et Callisto seems to have frozen solid before the process of differentiation was complete.Like our Moon's highlands, the surface of Callisto is covered with impact craters. The survival of these craters tells us that an icy object can form and retain impact craters m its surface. In thinking of ice so far from the Sun, it is important not to judge its behavior from that of the much warmer ice we know on Earth; at the temperatures of the outer solar system, ice on the surface is nearly as hard as rock, and behaves similarly. Ice on Callisto does not deform or flow like ice in glaciers on Earth. Callisto is unique among the planet-sized objects of the solar system in its absence of interior forces to drive geological evolution. The satellite was born dead and has remained geologically dead for more than four billion years.Ganymede, another of Jupiter's satellites and the largest in our solar system, is also cratered, but less so than Callisto. About one-quarter of its surface seems to be as old and heavily cratered; the rest formed more recently, as we can tell by the sparse covering of impact craters as well as the relative freshness of the craters. Ganymede is a differentiated world, like the terrestrial planets. Measurements of its gravity field tell us that the rock and metal sank to form a core about the size of our Moon, with a mantle and crust of ice floating above it. In addition, the Galileo spacecraft discovered that Ganymede has a magnetic field, the signature of a partially molten interior. Ganymede is not a dead world, but rather a place of continuing geological activity powered by an internal heat source. Much of its surface may be as young as half a billion years.The younger terrain is the result of tectonic and volcanic forces Some features formed when the crust cracked, flooding many of the craters with water from the interior. Extensive mountain ranges were formed from compression of the crust, forming long ridges with parallel valleys spaced one to two kilometers apart. In some places older impact craters were split and pulled apart. There are even indications of large-scale crustal movements that are similar to the plate tectonics of Earth.Why is Ganymede different from Callisto? Possibly the small difference in size and internal heating between the two led to this divergence in their evolution. But more likely the gravity of Jupiter is to blame for Ganymede's continuing geological activity. Ganymede is close enough to Jupiter that tidal forces from the giant planet may have episodically heated its interior and triggered major convulsions on its crust.paragraph 1From 1996 to 1999, the Galileo spacecraft passed through the Jovian system, providing much information about Jupiter's satellites. Callisto, the outermost of Jupiter's four largest satellites, orbits the planet in seventeen days at a distance from Jupiter of two million kilometers. Like our own Moon. Callisto rotates in the same period as it revolves, so it always keeps the same face toward Jupiter. Its noontime surface temperature is only about -140°C, so water ice is stable on its surface year-round. Callisto has a diameter of 4.820 kilometers, almost the same as that of Mercury. Its mass is only one-third as great, which means its density must be only one-third as great as well. This tells us that Callisto has far less of the rocky metallic materials found in the inner planets and must instead be an icy body through much of its interior.1.According to paragraph 1, which of the following statements about Callisto is true?A.It is the satellite closest to Jupiter's surfaceB.Its surface temperature is constant at all times of the day.C. It has the same mass and diameter as the planet MercuryD. It completes one rotation every seventeen days.2. According to paragraph 1, how do scientists know that Callisto is made up largely of ice?A. A sample of its interior was taken by the Galileo spacecraft in the late 1990sB. It has too low a density to contain much rocky metallic materialC. With a noontime surface temperature of only about .140° C. the ice on it never meltsD. All of the bodies in the Jovian system are icy, because they are so far from the Sun.paragraph 2Callisto has not fully differentiated, meaning separated into layers of different density materials. Astronomers can tell that it lacks a dense core from the details of its gravitational pull on the Galileo spacecraft during several very close flybys. This fact surprised scientists, who expected that all the big icy moons would be differentiated. It is much easier for an icy body to differentiate than for a rocky one, since the melting temperature of ice is so low. Only a little heating will soften the ice and get the process started, allowing the rock and metal to sink to the center and the slushy ice to float to the surface. Y et Callisto seems to have frozen solid before the process of differentiation was complete.3.Why does the author provide the information that “It is much easier for an icy body to differentiate than for a rocky one”?A. To support the claim that all of the big icy moons are differentiatedB. To suggest that Callisto may be a rocky body rather than an icy oneC. To explain why scientists expected Callisto to be differentiatedD. To refute the claim that Callisto could not differentiate because it was frozen solid4.All of the following questions are answered in paragraph 2 EXCEPT:A.Why was Callisto frozen solid before differentiation was complete?B.What allows the process of differentiation to get started?C. Why is it easier for an icy body to differentiate than a rocky one?D. How do astronomers know that Callisto lacks a dense core?paragraph 3Like our Moon's highlands, the surface of Callisto is covered with impact craters. The survival of these craters tells us that an icy object can form and retain impact craters m its surface. In thinking of ice so far from the Sun, it is important not to judge its behavior from that of the much warmer ice we know on Earth; at the temperatures of the outer solar system, ice on the surface is nearly as hard as rock, and behaves similarly. Ice on Callisto does not deform or flow like ice in glaciers on Earth. Callisto is unique among the planet-sized objects of the solar system in its absence of interior forces to drive geological evolution. The satellite was born dead and has remained geologically dead for more than four billion years.5. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. It should not be assumed that surface ice has the same characteristics wherever it is foundB. Surface ice and rock are much more similar in temperature in the outer solar system than they are on Earth.C. The further away surface ice is from the Sun, the more its temperature differs from that of the warmer ice on EarthD. In the cold of the outer solar system, surface ice is so hard it behaves more like rock than like the warmer ice on Earth6.According to paragraph 3, how is Callisto different from all other planet-sized objects in the solar system?A. It can form and retain impact craters on its icy surfaceB. It has ice glaciers that do not flow or deform.C. It has never had the interior forces required for geological evolution.D. It is more than four billion years old.paragraph 4Ganymede, another of Jupiter's satellites and the largest in our solar system, is also cratered, but less so thanCallisto. About one-quarter of its surface seems to be as old and heavily cratered; the rest formed more recently, as we can tell by the sparse covering of impact craters as well as the relative freshness of the craters. Ganymede is a differentiated world, like the terrestrial planets. Measurements of its gravity field tell us that the rock and metal sank to form a core about the size of our Moon, with a mantle and crust of ice floating above it. In addition, the Galileo spacecraft discovered that Ganymede has a magnetic field, the signature of a partially molten interior. Ganymede is not a dead world, but rather a place of continuing geological activity powered by an internal heat source. Much of its surface may be as young as half a billion years.7.The word “signature” in the passage is closest in meaning toA.primary causeB.end resultC.identifying markD.by-product8. According to paragraph 4, each of the following provides evidence about Ganymede's interior EXCEPTA. Ganymede's large sizeB. measurements of Ganymede's gravity fieldC. the fact that Ganymede has a magnetic fieldD. the fact that Ganymede continues to be geologically activeparagraph 5The younger terrain is the result of tectonic and volcanic forces Some features formed when the crust cracked, flooding many of the craters with water from the interior. Extensive mountain ranges were formed from compression of the crust, forming long ridges with parallel valleys spaced one to two kilometers apart. In some places older impact craters were split and pulled apart. There are even indications of large-scale crustal movements that are similar to the plate tectonics of Earth.9.The word “Extensive” in the passage is closet in meaning toA.UnusualrgeC.NewD.Steep10. Paragraph 5 supports each of the following statements about Ganymede EXCEPT:A. All water on it has always been frozen solid.B. There is evidence that part of its crust once broke openC. Its crust has been subject to forces that have created mountains and valleys.D. Some of its older craters have been split apart by more recent geological activityparagraph 6Why is Ganymede different from Callisto? Possibly the small difference in size and internal heating between the two led to this divergence in their evolution. But more likely the gravity of Jupiter is to blame for Ganymede's continuing geological activity. Ganymede is close enough to Jupiter that tidal forces from the giant planet may have episodically heated its interior and triggered major convulsions on its crust.11. According to paragraph 6, the differences in how Callisto and Ganymede evoked are most probably due to differences in theirA. size and internal heatingB. distance from JupiterC. chemical and physical compositionD. age12.Look at the four squares [■] that indicate where the following sentence could be added to the passage.The difference between Ganymede and Callisto, however, extend much further below the surface of the satellites.Where would the sentence best fit? Click on square [■] to add the sentence to the passageGanymede, another of Jupiter's satellites and the largest in our solar system, is also cratered, but less so than Callisto. [■] About one-quarter of its surface seems to be as old and heavily cratered; the rest formed more recently, as we can tell by the sparse covering of impact craters as well as the relative freshness of the craters. [■] Ganymede is a differentiated world, like the terrestrial planets. [■] Measurements of its gravity field tell us that the rock and metal sank to form a core about the size of our Moon, with a mantle and crust of ice floating above it. [■] In addition, the Galileo spacecraft discovered that Ganymede has a magnetic field, the signature of a partially molten interior. Ganymede is not a dead world, but rather a place of continuing geological activity powered by an internal heat source. Much of its surface may be as young as half a billion years.13. Directions:An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selected THREE answer choices that express the most important ideas in the passage.Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth 2 points.Drag your choices to the spaces where they belong. To review the passage, click on View TextBetween 600 B.C. and 450 B.C., Athens changed the distribution of political power betweenthe aristocracy and ordinary citizens.CallistoGanymede阅读三Answer ChoicesA. It has a core that consists mainly of rock and metal.B. It may have formed as recently as half a billion years agoC. Its interior is not fully solidD. Its evolution has probably been strongly influenced by Jupiter's gravityE. It always keeps the same face toward Jupiter as it orbits the planetF. Its crust is covered by slow-moving glaciersG. Its entire surface is heavily cratered。