托福TPO27阅读Passage3原文文本+题目+答案解析
为了帮助大家高效备考托福，为大家带来托福TPO27阅读Passage3原文文本+题目+答案解析，希望对大家备考有所帮助。
Predator-Prey Cycles How do predators affect populations of the prey animals?The answer is not as simple as might be thought.Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators.When wolves later reached the island,naturalists widely assumed that the wolves would play a key role in controlling the moose population.Careful studies have demonstrated,however,that this is not the case.The wolves eat mostly old or diseased animals that would not survive long anyway.In general,the moose population is controlled by food availability,disease and other factors rather than by wolves. 捕食者是怎样影响被捕食者的数量呢?答案并不是想象中那么简单。
麋鹿通过穿越冬天的冰层到达了在苏必略湖的罗亚尔岛，并由于没有捕食者而自由繁殖。
当狼在晚一点的时候到达那座岛时，自然学家都认为，狼对控制麋鹿的数量将起到关键作用。
但是，严密的研究说明并不是这样。
狼吃掉的大部分是年老的，或生病的动物，他们本身就不会存活很久。
一般地，麋鹿的数量是由食物、疾病、和其它的一些条件，而不是狼控制的。
When experimental populations are set up under simple laboratory conditions,the predator often exterminates its pre and then becomes extinct itself,having nothing left to eat.However,if safe areas like those prey animals have in the wild are provided,the prey population drops to low level but not extinction.Low prey population levels then provide inadequate food for the predators,causing the predator population to decrease.When this occurs,the prey population can rebound.In this situation the predator and prey population may continue in this cyclical pattern for some time. 在简单的实验条件下，捕食者经常吃掉了所有的实验设定的被捕食者，然后因为食物缺乏而自己灭绝了。
但是，如果能给被捕食动物提供如同在野外的安全的区域，被捕食动物的数量会降低到很低的数值，但不会灭绝。
被捕食者的数量的降低造成了捕食者的食物不足，使捕食者的数量下降。
此时，被捕食者的数量又会反弹。
这样，一定时间内捕食者和被捕食者的数量会持续地循环。
Population cycles are characteristic of small mammals,and they sometimes appear to be brought about by predators.Ecologists studying hare populations have found that the North American snow shoe hare follows a roughlyten-year cycle.Its numbers fall tenfold to thirty in a typical cycle,and a hundredfold change can occur.Two factors appear to be generating the cycle:food plants and predators. 这种数量的循环是小型哺乳动物的特性，有时候这种循环是由捕食者带来的。
生态学家对野兔数量的研究发现，北美白靴兔一直遵守着大约以十年为周期的循环。
在一个典型的循环中，其数量会以十倍到三十倍的减少，甚至会出现一百倍的改变。
有两种因素会导致这种循环：食物和捕食者。
The preferred foods of snowshoe hares are willow and birch twigs.As hare density increases,the quantity of these twigs decreases,forcing the hares to feed on low-quality high-fiber food.Lower birth rates,low juvenile survivorship,and low growth rates follow,so there is a corresponding decline in hare abundance.Once the hare population has declined,it takes two to three year for the quantity of twigs to recover. 白靴兔比较喜欢的食物是柳木和桦树树枝。
野兔的密度增加时，这些树枝的数量就减少，迫使野兔去吃一些低质量的，高纤维食物。
随之而来的是低生育率，低成活率，低生长率，所以野兔数量随之减少。
一旦野兔数量减少，树枝的数量需要两到三年恢复。
A key predator of the snowshoe hare is the Canada lynx.The Canada lynx shows a ten-year cycle of abundance that parallels the abundance cycle of hares.As hare numbers fall,so do lynx numbers,as their food supply depleted. 白靴兔的主要捕食者是加拿大山猫。
加拿大山猫的数量呈现了平行于野兔的十年为周期的循环。
野兔数量下降时，山猫的食物供给减少，数量也随之减少。
What causes the predator-prey oscillations?Do increasing number of hares lead to overharvesting of plants,which in turn results in reduced hare populations,or do increasing numbers of lynx lead to overharvesting hares?Field experiments carried out by Charles Krebs and coworkers in 1992 provide an answer.Krebs investigated experimental plots in Canada’s Yukon territory that contained hare populations.When food was added to those plots(no food effect)and predators were excluded(no predator effect)from an experimental area,hare numbers increased tenfold and stayed there—the cycle was lost.However,the cycle was retained if either of the factors was allowed to operate alone:if predators were excluded but food was not added(food effect alone),or if food was added in the presence of predators(predator effect alone).Thus both factors can affect the cycle,which,in practice,seems to be generated by conjunction of the two factors. 什么造成了捕食者和被捕食者的周期振动呢?是野兔数量的增长使得植物被过度采食，随之导致了野兔的减少还是山猫的增加导致了野兔被过度捕食?在1992年，Charles Krebs和其合作者的野外试验提供了答案。
Krebs研究了在加拿大Yuhon地区有野兔种群的试验田。
当食物被加到这片试验田(没有食品因素影响)并且将捕食者移去(也没有捕食者因素影响)。
野兔的数量增加了十倍并且保持稳定----不再循环。
但是，在任意一个因素单独存在时，循环都会出现：不管是捕食者被移除，食物不添加(也就是只有食物影响);还是食物在捕食者存在的情况下被添加(也就是只有捕食者影响)。
因此，两个因素都可以影响这个循环，即在现实中，循环是两个因素同时作用的结果。
Predators are an essential factor in maintaining communities that are rich and diverse in species.Without predators,the species that is the best competitor for。
托福TPO27口语Task3阅读文本+听力文本+题目+满分范文
(man) How come?
(woman) Well, the cost, for one thing, they are just not being realistic.
(man)ห้องสมุดไป่ตู้Even compare to the price of textbooks?
为了帮助大家高效备考托福，为大家带来托福 TPO27 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 TPO27 口语 Task3 阅读文本：
Switch to Electronic Textbooks
The university will begin switching from traditional-bound textbooks to electronic textbooks early next year. University students will be able to download the content of their required textbooks to a reading device and read the material directly from the device’s screen. While the cost of the device is around $200, it is a one-time expense. Considering the rising cost of textbooks, students will save money in the long run since purchasing electronic books for their classes is much less expensive than buying regular textbooks. Furthermore, the university believes the device will be an effective study aid because it is simple to operate and offers features such as highlighting of text and note-taking.
【威学教育】王鑫托福阅读TPO27-3阅读文本
【王鑫托福阅读】托福TPO 全集之TPO27-3TPO 27TPO27-3 Predator Prey Cycles1. In paragraph 1, why does the author discuss the moose and wolves on Isle Royale?A To provide an example of predators moving to new habitats by following migrating preyB To show that the interactions between predator populations and prey populations are not always might be expectedC To suggest that prey populations are more influenced by predation than food availability and diseaseD To argue that studies of geographically isolated populations tend not to be useful to naturalists2. The word “rebound” in the passage is closest in meaning to A escapeB recoverC surviveD resist3. Paragraph 2 implies which of the following about experimental environments in which predators become extinct?A They may yield results that do not accurate predict changes of populations in the wild.B In these environments, the prey species is better adapted than the predator species.C These environments are appropriate only for studying small populations of predators and prey.D They are unrealistic because some predators are also the prey of other predators.4. Which of the following can be inferred from paragraphs 2 and 3 about the small mammals that experience population cycles? A Their population cycles are not affected by predators.B Their predators' populations periodically disappear.C They typically undergo ten-year cycles.D They have access to places safe from predators.How do predators affect populations of the prey animals? The answer is not as simple as might be thought. Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators. When wolves later reached the island, naturalists widely assumed that the wolves would play a key role in controlling the moose population. Careful studies have demonstrated, however, that this is not the case. The wolves eat mostly old or diseased animals that would not survive long anyway. In general, the moose population is controlled by food availability, disease and other factors rather than by wolves.When experimental populations are set up under simple laboratory conditions, the predator often exterminates its prey and then becomes extinct itself, having nothing left to eat. However, if safe areas like those prey animals have in the wild are provided, the prey population drops to low level but not extinction. Low prey population levels then provide inadequate food for the predators, causing the predator population to decrease. When this occurs, the prey population can rebound. In this situation the predator and prey population may continue in this cyclical pattern for some time.Population cycles are characteristic of small mammals, and they sometimes appear to be brought about by predators. Ecologists studying hare populations have found that the North American snow shoe hare follows a roughly ten-year cycle. Its numbers fall tenfold to thirty in a typical cycle, and a hundredfold change can occur. Two factors appear to be generating the cycle: food plants and predators.5. The word “roughly” in the passage is closest in meaning toA usuallyB repeatingC approximatelyD observable6. The word “generating” in the passage is closest in meaning toA producingB changingC speeding upD smoothing out7. to paragraph 4, all of the following are true of the food of snowshoe hares EXCEPT A The preferred food fore hares consists of willow and birch twigs.B High fiber food is the most nutritious for hares.C Depletion of the supply of willow and birch twigs cause low birth and growth rates.D The food supply takes two or three years to recover8. The word “conjunction” in the passage is closest in meaning to A determinationB combinationC alternationD transformation9. According to paragraph 5, which of the following statements best characterizes the abundance cycle of the Canada lynx?A It closely follows the cycle the snowshoe hare.B When the numbers of lynx fall, the numbers of snowshoe hares soon decrease.The preferred foods of snowshoe hares are willow and birch twigs. As hare density increases, the quantity of these twigs decreases, forcing the hares to feed on low-quality high-fiber food. Lower birth rates, low juvenile survivorship, and low growth rates follow, so there is a corresponding decline in hare abundance. Once the hare population has declined, it takes two to three year for the quantity of twigs to recover.A key predator of the snowshoe hare is the Canada lynx. The Canada lynx shows a ten-year cycle of abundance that parallels the abundance cycle of hares. As hare numbers fall, so do lynx numbers, as their food supply depleted.What causes the predator-prey oscillations? Do increasing number of hares lead to overharvesting of plants, which in turn results in reduced hare populations, or do increasing numbers of lynx lead to overharvesting hares? Field experiments carried out by Charles Krebs and coworkers in 1992 provide an answer. Krebs investigated experimental plots in Canada's Yukon territory that contained hare populations. When food was added to those plots (no food effect) and predators were excluded (no predator effect) from an experimental area, hare numbers increased tenfold and stayed there—the cycle was lost. However, the cycle was retained if either of the factorsC When hare numbers decrease, lynx numbers increase.D It is not clearly related to the availability of lynx food.10. According to paragraph 6, which of the following was true of the hare population cycle in Krebs's experiment?A The effects of providing food while at the same time introducing predators cancelled each other, so there was no cycle.B The cycle existed when either the food supply was limited or there were predators.C There was a cycle when there were no predators and food was supplied.D If the hares had places to hide from the lynx, the hare population increased tenfold and then remained at that level.11. According to paragraph 7, which of the following statements correctly characterizes the effect of sea stars on the ecosystem in which they are predators of bivalves?A Bivalve population are kept low, allowing species that compete with bivalves to survive.B The numbers of most species of bivalves are greatly reduced, leaving the bivalve species that is the strongest competitor to dominate among the survivors.C Biological diversity begins to decrease because many bivalve species disappear.D Sea stars dominate at first but then die off because of the depleted food supply.12. According to paragraph 7, which of the following is true of the phenomenon of competitor exclusion?A It results in more diverse communities.B It requires the presence of predators.C It affects all competitions equally.D It happens only when there is a dominant competitor.was allowed to operate alone: if predators were excluded but food was not added (food effect alone), or if food was added in the presence of predators (predator effect alone). Thus both factors can affect the cycle, which, in practice, seems to be generated by conjunction of the two factors.K作义/ 产Predators are an essential factor in maintaining communities that are rich and diverse in species. Without predators, the species that is the best competitor for food, shelter, nesting sites, and other environmental resources tends to dominate and exclude the species with which it competes. This phenomenon is known as “competitor exclusion”. However, i f the community contains a predator of the strongest competitor species, then the population of that competitor is controlled. Thus even the less competitive species are able to survive. For example, sea stars prey on a variety of bivalve mollusks and prevent these bivalves from monopolizing habitats on the sea floor. This opens up space for many other organisms. When sea stars are removed, speciesdiversity falls sharply. Therefore, from the stand point of diversity, it is usually a mistake to eliminate a major predator from a community.Predators are an essential factor in maintaining communities that are rich and diverse in species. Without predators, the species that is the best competitor for food, shelter, nesting sites, and other environmental resources tends to dominate and exclude the species with which it competes. (This phenomenon is known as “competitor exclusion”. (However, if the community contains a predator of the strongest competitor species, then the population of that competitor is controlled. (Thus even the less competitive species are able to survive. (For example, sea stars prey on a variety of bivalve mollusks and prevent these bivalves from monopolizing habitats on the sea floor. This opens up space for many other organisms. When sea stars are removed, species diversity falls sharply. Therefore, from the stand point of diversity, it is usually a mistake to eliminate a major predator from a community.13. Look at the four squares [(] that indicate where the following sentence could be added to the passage. Where would the sentence best fit?As a result, there are not enough of the strong competitions to monopolize the environment’ s resources.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. The relationships between predators and prey are complex.A. Studies of the interactions between wolves and moose on Isle Royale in Lake Superior reveal that wolf predation is not the primary factor controlling the moose population.B. Ecologists are interested in studying predator-prey population cycles because understanding how predators and prey interact will allow better wildlife management programs.C. Predators help maintain biological diversity by limiting populations of a dominant competitor species, thereby preventing that species from excluding others.D. In predator-prey population cycles, predator populations increase or decrease following similar population changes in the species they prey on.E. A species’ population tends to rise and falls in a cycle pattern if the food supply for the population is limited, or if the population has a major predator.F. The removal of sea stars reduces the diversity of the community in which they are predators, and is therefore a bad idea.。
TPO27 R-3 原文翻译
TPO27 R-3 原文翻译Predator-Prey Cycles捕食者是怎样影响被捕食者的数量的呢？答案并不是想象中那么简单的。
麋鹿通过穿越冬天的冰层和到达了在苏必略路的罗亚尔岛，在那他们因为和捕食者分隔开来就更自由了。
当狼在晚一点的时候到达那座岛的时候，自然学家都认为，狼对控制麋鹿的数量起到了关键的作用。
但是，严密的研究已经说明，并不是这样的。
狼吃掉的大部分是年老的，或是已经生病的动物，他们本身就不会存活很久了。
总的来说，麋鹿的数量是由食物的可利用性，疾病，和其他的一些条件，而不是因为狼。
当实验性的数量被设置在简单的实验条件下，捕食者经常吃掉了所有的被捕食者，然后因为没有东西吃，自己灭绝了。
但是，如果能给被捕食动物提供如同在野外的安全的区域，被捕食动物的数量会降低到很低的数值，但不会灭绝。
低的被捕食动物数量造成了捕食者的食物不足，使捕食者的数量下降。
当这个情况发生的时候，被捕食动物的数量又会反弹。
这样，在一定的时候，捕食者和被捕食者的数量会持续地在这种循环中变化。
这种数量的循环是小型哺乳动物的特性，有时候这种循环的出现是由捕食者带来的。
生态学家对野兔数量的研究已经显示，北美“雪鞋野兔”一直遵守着大约以十年为一周期的循环。
在一个典型的循环中，其数量会以十倍到三十倍的减少，甚至会出现百倍的改变会出现。
有两种因素会导致这种循环：食物和捕食者。
“雪鞋野兔”比较喜欢的食物是柳木和桦树树枝。
当野兔的密度增加的时候，这些树枝的数量就会减少，迫使野兔去吃一些低质量的，高纤维食物。
随之而来的是低生育率，低成活率，低生长率，所以产生了对应的野兔数量的减少反应。
一旦野兔数量减少了，树枝的数量会需要两到三年去恢复。
雪鞋野兔的主要捕食者是加拿大山猫。
加拿大山猫呈现了平行于野兔的十年鼎盛循环。
当野兔的数量下降的时候，当山猫的食物供给减少，山猫数量也会发生同样的变化。
是什么造成了捕食者和被捕食者的振幅呢？是野兔数量的增长使得植物被过度破坏，随之导致了野兔的减少？还是山猫的增加导致了野兔被过度捕捉？在1992年，Charles Krebs 和其合作者的野外试验提供了答案。
老托福阅读试题及答案：PASSAGE27
老托福阅读试题及答案：PASSAGE27推荐文章老托福阅读真题及答案：PASSAGE30 热度：老托福阅读100篇passage33试题及答案热度：老托福阅读真题及答案：PASSAGE2 热度：托福阅读TPO14(试题+答案+译文)第1篇:儿童与广告热度：老托福阅读试题及答案：PASSAGE30 热度：为了帮助大家备考托福阅读，提高成绩，下面小编给大家带来老托福阅读真题及答案:passage 27，希望大家喜欢！老托福阅读试题及答案：PASSAGE 27The mineral particles found in soil range in size from microscopic clay particles to large boulders. The most abundant particles — sand, silt, and clay — are the focus of examination in studies of soil texture. Texture is the term used to describe the composite sizes of particles in a soil sample, typically several representative handfuls.To measure soil texture, the sand, silt, and clay particles are sorted out by size and weight. The weights of each size are then expressed as a percentage of the sample weight. In the field, soil texture can be estimated by extracting a handful of soil and squeezing the damp soil into three basic shapes; (1) cast, a lump formed by squeezing a sample in a clenched fist; (2) thread, a pencil shape formed by rolling soil between the palms; and (3) ribbon, a flatfish shape formed by squeezing a small sample between the thumb and index finger. The behavioral characteristics of the soil when molded into each of these shapes, if they can be formed at all, provide the basis for a general textural classification. The behavior of the soil in the hand test is determined by the amount of clay in the sample. Clay particles are highly cohesive, and when dampened, behave as a plastic.Therefore the higher the clay content in a sample, the more refined and durable the shapes into which it can be molded.Another method of determining soil texture involves the use of devices called sediment sieves, screens built with a specified mesh size. When the soil is filtered through a group of sieves, each with a different mesh size, the particles become grouped in corresponding size categories. Each category can be weighed to make a textural determination. Although sieves work well for silt, sand, and larger particles, they are not appropriate for clay particles. Clay is far too small to sieve accurately; therefore, in soils with a high proportion of clay, the fine particles are measured on the basis of their settling velocity when suspended in water. Since clays settle so slowly, they are easily segregated from sand and silt. The water can be drawn off and evaporated, leaving a residue of clay, which can be weighed.1. What does the passage mainly discuss?(A) Characteristics of high quality soil(B) Particles typically found in most soils(C) How a high clay content affects the texture of soil(D) Ways to determine the texture of soil2. The author mentions "several representative handfuls" in line 4 in order to show(A) the range of soil samples(B) the process by which soil is weighed(C) the requirements for an adequate soil sample(D) how small soil particles are weighted3. The phrase "sorted out" in line 5 is closest in meaning to(A) mixed(B) replaced(C) carried(D) separated4. It can be inferred that the names of the three basic shapes mentioned in paragraph 2 reflect(A) the way the soil is extracted(B) the results of squeezing the soil(C) the need to check more than one handful(D) the difficulty of forming different shapes5. The word "dampened" in line 14 is closest in meaning to(A) damaged(B) stretched(C) moistened(D) examined6. Which of the following can be inferred from the passage about a soil sample with little or no clay in it?(A) It is not very heavy.(B) It may not hold its shape when molded.(C) Its shape is durable(D) Its texture cannot be classified7. The word "they" in line 21 refers to(A) categories(B) sieves(C) larger particles(D) clay particles8. It can be inferred from the passage that the sediment sieve has an advantage over the hand test in determining soil texture because(A) using the sieve takes less time(B) the sieve can measure clay(C) less training is required to use the sieve(D) the sieve allows for a more exact measure9. During the procedure described in paragraph 3, when clay particles are placed into water they(A) stick to the sides of the water container(B) take some time to sink to the bottom(C) separate into different sizes(D) dissolve quickly10. The word "fine" in line 24 is closest in meaning to(A) tiny(B) many(C) excellent(D) various11. All of the following words are defined in the passage EXCEPT(A) texture (line 3)(B) ribbon (line 10)(C) sediment sieves (line 18)(D) evaporated (line 25)正确答案：DADBC BBDBA D托福阅读怎么练?有些考生则喜欢把文章一字不漏地细读之后再做题。
tpo27托福范文
托福TPO27指的是什么呢？1。
原句讲了两个重点，一是人口估计不准，二是U这个地方的居民能自给自足。
A选项的前半正确，但后半句说不依靠农业明显是错的，不选；B说不确定是否能feed，跟原文相反，不选；C选项不但因果关系有问题，而且原因说不能feed他们自己，也与原文相反，不选；正确答案D，重点说的是能support他们自己，尽管没有说人口估计不准，但原文的转折重点体现在后半句，所以正确答案是D 2。
surpass超过，不懂的可以拆分，至少有pass，应该与超过有关，而选项中与超过有关的只有B，就算不认识也可以通过前缀ex-表明XX之外，说明与“过”有关。
A在XXX之前，C挑战D比XX持久都不沾边儿 3。
EXCEPT题，排除法。
A的permanent settlement做关键词定位至第二句，A正确，不选；B的self-sufficient自给自足作为形容词很难在原文中找到，但第一题简化句子题的那个句子中有这个信息，所以这个选项正确，不选；C的other larger settlement没讲，错，选；D选项同样出现在句子简化题的句子当中，正确，不选4。
intact未受破坏的，完整的，所以正确答案是C的undamaged。
原词in前缀表示否定，tact表示接触，碰。
代入原文，原文讲由于一些不明的原因，很多bowl被抛弃了，仍然是XXX状态，在整个近东地区发现了若干只，A没卖出去D没画上都不沾边，B没使用代入是说得通的，但原词没有unused的意思，不能选 5。
以beveled-rim bowls和专有名词做关键词定位至第五句，原句讲早期的一个考古学遗址上发现了这个style，特别具有这一过程的特点，被称为beveled-rim bowl，但仅凭此句无法选出答案，于是向下，下一句说由于是用mold做的，因此只有数目不多的standard size，所以正确答案是D。
B说形状和装饰变化很大，C说各具特色，这都不是mold能够完成的，因此与D相反，都错；A的discard原文有讲到，但原文也明确说不知道什么原因，所以unpopular错 6。
新托福TPO27阅读原文及译文(三)
新托福TPO27阅读原文(一)：Crafts in the Ancient Near EastTPO27-1：Crafts in the Ancient Near EastSome of the earliest human civilizations arose in southern Mesopotamia, in what is now southern Iraq, in the fourth millennium B.C.E. In the second half of the millennium, in the south around the city of Uruk, there was an enormous escalation in the area occupied by permanent settlements. A large part of that increase took place in Uruk itself, which became a real urban center surrounded by a set of secondary settlements. While population estimates are notoriously unreliable, scholars assume that Uruk inhabitants were able to support themselves from the agricultural production of the field surrounding the city, which could be reached with a daily commute. But Uruk’s dominant size in the entire region, far surpassing that of other settlements, indicates that it was a regional center and a true city. Indeed, it was the first city in human history.The vast majority of its population remained active in agriculture, even those people living within the city itself. But a small segment of the urban society started to specialize in nonagricultural tasks as a result of the city’s role as a regional center. Within the productive sector, there was a growth of a variety of specialist craftspeople. Early in the Uruk period, the use of undecorated utilitarian pottery was probably the result of specialized mass production. In an early fourth-millennium level of the Eanna archaeological site at Uruk, a pottery style appears that is most characteristic of this process, the so-called beveled-rim bowl. It is a rather shallow bowl that was crudely made in a mold; hence, in only a limited number of standard sizes. For some unknown reason, many were discarded, often still intact, and thousands have been found all over the Near East. The beveled-rim bowl is one of the most telling diagnostic finds for identifying an Uruk-period site. Of importance is the fact that it was produced rapidly in large amounts, most likely by specialists in a central location.A variety of documentation indicates that certain goods, once made by a family member as one of many duties, were later made by skilled artisans. Certain images depict groups of people, most likely women, involved in weaving textiles, an activitywe know from later third-millennium texts to have been vital in the economy and to have been centrally administered. Also, a specialized metal-producing workshop may have been excavated in a small area at Uruk. It contained a number of channels lined by a sequence of holes, about 50 centimeters deep, all showing burn marks and filled with ashes. This has been interpreted as the remains of a workshop where molten metal was scooped up from the channel and poured into molds in the holes. Some type of mass production by specialists were involved here.Objects themselves suggest that they were the work of skilled professionals. In the late Uruk period(3500-3100 B.C.E.), there first appeared a type of object that remained characteristic for Mesopotamia throughout its entire history: the cylinder seal. This was a small cylinder, usually no more than 3 centimeters high and 2 centimeters in diameter, of shell, bone, faience (a glassy type of stoneware), or various types of stones, on which a scene was carved into the surface. When rolled over a soft material----primarily the clay of bullae (round seals), tablets, or clay lumps attached to boxes, jars, or door bolts----the scene would appear in relief, easily legible. The technological knowledge needed to carved it was far superior to that for stamp seals, which had happened in the early Neolithic period (approximately 10,000-5000 B.C.E.). From the first appearance of cylinder seals, the carved scenes could be highly elaborate and refined, indicating the work of specialist stone-cutters. Similarly, the late Uruk period shows the first monumental art, relief, and statuary in the round, made with a degree of mastery that only a professional could have produced.TPO27-1译文：古代近东的工匠一些最早的人类文明是在公元前四千年前的南美索不达米亚出现的，现在这片区域处于南伊拉克。
【托福写作资料】TPO27综合写作文本与解析
【托福写作资料】TPO27综合写作文本与解析TPO综合写作范文是考生练习托福写作的必备资料，很多考生在网上求这份资料。
那么，在以下内容中，就为大家带TPO综合写作文本与解析，希望能为大家的备考带来帮助。
托福TPO27综合写作题目 Reading Part:The little ice age was a period of unusually cold temperature in many partsof the world that lasted from about the year 1350 until 1900CE. There wereunusually harsh winters, and glaciers grew larger in many areas. Scientist havelong wondered what caused the Little Ice Age. Several possible causes have beenproposed.First, the cooling may have been caused by disrupting of ocean currents.Before the Little Ice Age, there was a period of unusually warm weather duringwhich glaciers melted. These melted glaciers sent a large amount of coldfreshwater into the Gulf Stream, a large ocean current that strongly affectsEarth’s climate. Some scientists believe that this freshwater was enough totemporarily disrupt the Gulf Stream. Such a disruption could have caused theLittle Ice Age.Second, volcanic eruption could have caused the Little Ice Age. Whenvolcanoes erupt, they send dark clouds of dust and sulfur gas into theatmosphere. These clouds, which can spread over great areas, block some sunlightfrom reaching Earth’s surface. This can decrease the global temperatures.Scientists know of several volcanic eruption that took place during the LittleIce Age.Third, substantial decreases in human populations may have contributedindirectly to the cooling of the climate. For a variety of reason(disease, warfare, social disruption), the human population just before the Little Ice Age and during the early part of it was lower than it had been in a long time.Forest trees started growing on fields that were no longer used for agriculture.Since trees absorb carbon dioxide, a greenhouse gas, they decrease thegreenhouse effect that keeps Earth warm. With more forest trees carbon dioxide, earth became cooler.托福TPO27综合写作题目 Listening Part:Unfortunately，the arguments of the reading passage are a little out of date.Scientists now have new information that shows that none of the ideas the reading passage discusses could account for the Little Ice Age.First，about the Gulf Stream.Scientists now know that disrupting the Gulf Stream would cause cooling only in Europe and North America，but the Little Ice Age also affected the Southern hemisphere，in places like New Zealand and Southern Africa for example.Since the disruption of the Gulf Stream cannot explain why these southern areas became colder，it cannot explain the Little Ice Age.Second, the volcanoes theory.It’s true that if volcanic eruptions put enoughdust into the atmosphere.the result can be a cooler climate.But large amounts ofvolcanic dust in the atmosphere would have also produced striking visual effectthat people would have noticed at the time.For example.Dramatically colorfulSunsets or snow being grey or brown instead of white.But there are almost no reports of anything like that routinely happening during the Little Ice Age.So it seems that the volcanic eruptions during that period were simply not strong enough to release the large amounts of dust needed to lower globaltemperatures.Third, about forests on farmland stopping the warming greenhouse effect by removing carbon dioxide.There just was not enough time for this effect to work.The human population grew back to previous levels fairly quickly，which meant that forests were soon being cut down again to clear fields for the crops needed to feed the growing population.As a result，we know that the forests mentioned in the reading passage were not there long enough to cause the long—term global cooling of the climate.托福TPO27综合写作题目 Question:Summarize the point made in the lecture ， being sure to explain how the cast doubt on specific points made in the reading passage.托福TPO27综合写作答案解析：In the reading passage, the author claims that the cause of the Little IceAge was due to three main reasons. The lecturer, however, reputes the writer’sopinion one by one with strong arguments.Firstly, the passage argues that the Gulf Stream formed in the previous warmperiod was responsible for the appearance of the unexpected Little Ice Age. Yet, the speaker argues that the so-called Gulf Stream only contributed to the cooling weather in Northern hemisphere while Little Ice Age took place all over the world. Thus, global Little Ice Age cannot be Next, according to the reading material, dust and sulfur gas caused by volcanic eruptions would block sunlight, and resulted in Little Ice Age. he lecturer, however, holds that volcanic eruptions should have led to other visual phenomena than cooling weather, like colorful sunsets or grey snow. But unfortunately none of them were reported. Once taken this into consideration, volcanic eruptions seems not strong enough to release the large amounts of dusts needed to lower global temperatures. Last but not least, the writer states that the substantial decrease in human population may cause the unusual Little Ice Age. Again the speaker argues.。
托福备考托福阅读34套TPO样题+解析+译文26—3 Sumer and the First Cities of the Ancient Near East
托福考试 复习TPO 26—3 Sumer and the First Cities of the Ancient Near East原文：【1】The earliest of the city states of the ancient Near East appeared at the southern end of the Mesopotamian plain, the area between the Tigris and Euphrates rivers in what is now Iraq. It was here that the civilization known as Sumer emerged in its earliest form in the fifth millennium. At first sight, the plain did not appear to be a likely home for a civilization. There were few natural resources, no timber, stone, or metals. Rainfall was limited, and what water there was rushed across the plain in the annual flood of melted snow. As the plain fell only 20 meters in 500 kilometers, the beds of the rivers shifted constantly. It was this that made the organization of irrigation, particularly the building of canals to channel and preserve the water, essential. Once this was done and the silt carried down by the rivers was planted, the rewards were rich: four to five times what rain-fed earth would produce. It was these conditions that allowed an elite to emerge, probably as an organizing class, and to sustain itself through the control of surplus crops.【2】It is difficult to isolate the factors that led to the next development—the emergence of urban settlements. The earliest, that of Eridu, about 4500 B.C.E., and Uruk, a thousand years later, center on impressive temple complexes built of mud brick. In some way, the elite had associated themselves with the power of the gods. Uruk, for instance, had two patron gods—Anu, the god of the sky and sovereign of all other gods, and Inanna, a goddess of love and war—and there were others, patrons of different cities. Human beings were at their mercy. The biblical story ofthe Flood may originate in Sumer. In the earliest version, the gods destroy the human race because its clamor had been so disturbing to them.【3】It used to be believed that before 3000 B.C.E. the political and economic life of the cities was centered on their temples, but it now seems probable that the cities had secular rulers from earliest times. Within the city lived administrators, craftspeople, and merchants. (Trading was important, as so many raw materials, the semiprecious stones for the decoration of the temples, timbers for roofs, and all metals, had to be imported.) An increasingly sophisticated system of administration led in about 3300 B.C.E. to the appearance of writing. The earliest script was based on logograms, with a symbol being used to express a whole word. The logograms were incised on damp clay tablets with a stylus with a wedge shape at its end. (The Romans called the shape cuneus and this gives the script its name of cuneiform.) Two thousand logograms have been recorded from these early centuries of writing.A more economical approach was to use a sign to express not a whole word but a single syllable. (To take an example: the Sumerian word for " head” was “sag.” Whenever a word including a syllable in which the sound “sag” was to be written, the sign for “sag" could be used t o express that syllable with the remaining syllables of the word expressed by other signs.) By 2300 B.C.E. the number of signs required had been reduced to 600, and the range of words that could be expressed had widened. Texts dealing with economic matters predominated, as they always had done; but at this point works of theology, literature, history, and law also appeared.【4】Other innovations of the late fourth millennium include the wheel, probably developed first as a more efficient way of making pottery and then transferred to transport. A tablet engraved about 3000 B.C.E. provides the earliest known example from Sumer, a roofed boxlike sledge mounted on four solid wheels. A major development was the discovery, again about 3000 B.C.E., that if copper, which had been known in Mesopotamia since about 3500 B.C.E., was mixed with tin, a much harder metal, bronze, would result. Although copper and stone tools continued to be used, bronze was far more successful in creating sharp edges that could be used as anything from saws and scythes to weapons. The period from 3000 to 1000 B.C.E., when the use of bronze became widespread, is normally referred to as the Bronze Age.题目：1.Which of the following is NOT mentioned in paragraph 1 as a disadvantage of the Mesopotamian plain?A.There was not very much rainfall for most of the year.B.Melting snow caused flooding every year.C.The silt deposited by rivers damaged crops.D.Timber, stone and metals were not readily available.2.According to paragraph 1, which of the following made it possible for anelite to emerge?A.New crops were developed that were better suited to conditions on theMesopotamian plain.B.The richest individuals managed to gain control of the most valuable cropland.C.Control over the few available natural resources made some people four to five times richer than everyone else.D.The building of canals to increase agricultural output required organization.3.The word “sustain”in the passage（paragraph 1）is closest in meaning toA.defend.B.promote.C.maintain.D.transform.4.According to paragraph 2, Eridu and Uruk are examples of urbansettlements thatcked the features usually found in other early urban settlements.B.developed around religious buildings.C.grew much more rapidly than most of the urban settlements found in Sumer.D.were mysteriously destroyed and abandoned.5.The word “sovereign"in the passage is closest in meaning toA.counselor.B.master.C.defender.D.creator.6.According to paragraph 3, which of the following led to the appearanceof writing?A.An increasingly sophisticated administrative system.B.Coordination between secular and religious leaders.C.The large volume of trade, particularly imports.D.A rapidly expanding and changing population.7.In paragraph 3, why does the author provide the information that the number of signs in use had dropped from 2,000 to 600 by 2300 B.C.E.?A.T o argue that the development of writing involved periods of growth followed by periods of decline.B.To demonstrate that earlier written texts used a larger vocabulary than later texts, which were aimed at a broader audience.C.To support the claim that the range of words expressed by logograms varied widely depending on time period and type of text.D.T o provide evidence for the increased efficiency of using signs to express syllables rather than whole words.8.According to paragraph 3, ancient texts most commonly dealt withA.theology.B.literature.C.economics.w.9.According to paragraph 4, the earliest wheels probablyA.were first developed in areas outside Mesopotamia.B.were used to make pottery.C.appeared on boxlike sledges.D.were used to transport goods between cities.10.The word “engraved”in the passage(paragraph 4)is closest in meaning toA.carved.B.produced.C.dated.D.discovered.11.Which of the sentences below best expresses the essential information inthe highlighted sentence in the passage paragraph 4 ? Incorrect choices change the meaning in important ways or leave out essential information.A.Also around 3000B.C.E., it was discovered that mixing copper, known from about 3500 B.C.E., with tin would create a much harder metal known as bronze.B.Although copper had been known since 3500 B.C.E in Mesopotamia, the discovery of bronze did not occur until around 3000 B.C.E.C.Another major development around 3000 B.C.E. was the discovery that copper could be mixed with a much harder metal known as tin.D.The development of bronze by mixing copper and tin probably occurred around 3000 B.C.E. but may have happened as early as 3500 B.C.E.12.The word “widespread”in the passage(paragraph 4)is closest in meaning toA.obvious.B.significant.C.necessary.mon.13. Look at the four squares [■]that indicate where the following sentence could be added to the passage.Where would the sentence best fit? City life was diverse, and the population was engaged in a variety of occupations.It used to be believed that before 3000 B.C.E. the political and economic life of the cities was centered on their temples, but it now seems probable that the cities had secular rulers from earliest times. ■【A】Within the city lived administrators, craftspeople, and merchants. (Trading was important, as so many raw materials,the semiprecious stones for the decoration of the temples, timbers for roofs,and all metals, had to be imported.) ■【B】An increasingly sophisticated system of administrationled in about 3300 B.C.E. to the appearance of writing. ■【C】The earliest script was based on logograms, with asymbol being used to express a whole word. ■【D】The logograms were incised on damp clay tablets with a stylus with a wedge shape at its end. (The Romans called the shape cuneus and this gives the script its name of cuneiform.) Two thousand logograms have been recorded from these early centuries of writing. A more economical approach wasto use a sign to express not a whole word but a single syllable. (To take an example: the Sumerian word for " head” was “sag.” Whenever a wordincluding a syllable in which the sound “sag” was to be written, the sign for“sag" could be used to express that syllable with the remaining syllablesof the word expressed by other signs.) By 2300 B.C.E. the number of signs required had been reduced to 600, and the range of words that could be expressed had widened. Texts dealing with economic matters predominated, as they alwayshad done; but at this point works of theology,literature, history, and lawalso appeared.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 minorideas in the passage. This question is worth 2 points.Irrigation made it possible for the civilization known as Sumer to arise on the Mesopotamian plain in the fifth millennium B.C.E.A.The scarcity of natural resources on the plain made it necessary for a powerful elite to emerge and take charge of trade and imports.B.The economy of each city was based on a craft such as pottery or metal working, and the city of Eridu was known for its saws, scythes and weapons.C.Writing appeared in the form of logograms and later developed into a system using signs to represent syllables rather than whole words.D.Priests were powerful figures in the ancient civilization and controlled the political and economic life of the cities.E.The earliest city states had one or more patron gods and were built around central temple complexes.F.The development of the wheel and the creation of bronze were important innovations in Sumer答案：1.A选项的rainfall和B的melting snow做关键词定位至第五句，都正确，不选；C的silt 确实讲过，但并没讲damaged crops，所以C错，选；D的timber, stone and metals定位至第四句，正确，不选。
托福阅读真题第27套
第27套BirdsongParagraph1Birdsong is the classic example of how genes(hereditary information)and environment both have a crucial role to play in the behavioral development of animals. Since the pioneering work of W.H.Thorpe on chaffinches(a common European bird), many species have been studied,and it has become clear both that learning plays an important role for all species and also that there are constraints on what they are able to learn.1.The word“pioneering”in the passage is closet in meaning torecentfamousoriginalcontroversialParagraph2Thorpe was able to show that learning from others was involved in chaffinch birds through a series of experiments on hand-reared chicks(young birds).As in most other species,only the males sing.Thorpe found that,if he raised young males in total isolation from all others,the song they produced was quite different from that of a normal adult.It was about the right length and in the correct frequency range.It was also split up into a series of notes as it should be.But these notes lacked the detailed structure found in wild birds,nor was the song split up into distinct phrases as it usually is.This suggested that song development requires some social ter experiments in which researchers played recordings of songs to young birds showed just how precise this influence was:many of them would learn the exact pattern of the recording they had heard.A remarkable feature here was that birds were able to copy precisely songs that they only heard in the first few weeks of life,yet they did not sing themselves until about eight months old.They are thus able to store a memory of the sound within their brain and then match their own output to their recollection of it when they mature.2.The word“distinct”in the passage is closet in meaning toshortsimpleseparatesimilar3.According to paragraph2,all of the following are characteristics of the songs ofthe young chaffinches in Thorpe’s experiment EXCEPT:They were not identical to the songs of normal adult chaffinches.They lacked the complex form of the songs of wild chaffinches.They were as long as the songs of normal adult chaffinches.They were clearly different from each other.4.According to paragraph2,researchers discovered which of the following byplaying recordings of songs to chaffinches?Chaffinches could no longer be taught to reproduce sounds after the first few weeks of life.Chaffinches could not reproduce songs with exactly the same patterns of recorded songs.Chaffinches at the age of eight months could recall and reproduce a song that they heard in the first few weeks of life.Chaffinches that learned a song from recordings in the first few weeks of life were later unable to copy the sounds of mature chaffinches.5.All of the following are mentioned in paragraph2as characteristics of wildchaffinches EXCEPT:They are able to copy songs very precisely.Their song development requires interaction with other chaffinches.Their songs are not as well-structured as the songs of other birds.It is the males of the species that do the singing.Paragraph3Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themselves belong.These constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.The crude song of a bird reared in isolation gives some clues as to what this rough idea may be:the length, the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and those reared in isolation.In other cases the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a live tutor.In some cases this may occur when they are young birds,but in others the main learning period is when they set up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countering with them. Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.6.The word“enabling”in the passage is closet in meaning toallowingchallengingforcingpreparing7.It can be inferred from paragraph3that one of the functions of songs in birds is to bring together birds living in groups with birds living in isolationhelp young birds distinguish other young birds from adultsmake possible interactions between birds of different specieshelp birds to establish territories8.Which of the sentences below best expresses the essential information in thehighlighted sentence in the passage?Incorrect choices change the meaning in important ways or leave out essential information.Songs produced by chaffinches reared in isolation are cruder than the songs of wild birds.The song of a bird reared in isolation suggests which aspects of chaffinch song may be inborn.Comparing the crude songs of chaffinches reared in isolation to the songs of wild chaffinches suggests differences as well as similarities.Studying the song aspects of chaffinches reared in isolation,researchers have gained a better understanding of the songs produced by wild birds.9.According to paragraph3,in some species,young birds do not copy songs fromrecordings becausethey learn to sing only by live interactions with other birdstheir ability to learn from recordings occurs later in lifethey can only learn the songs of the birds living in their area of woodlandthey can only learn songs from other birds of their own species10.Why does the author mention that it is very unusual to hear a wild bird singing asong which is not typical of its own species?To explain why a variety of different bird songs are often heard in a relatively small areaTo argue that social constraints have a greater impact upon learning than do genetic constraintsTo provide an example of how the process of learning rules varies from one species to anotherTo illustrate how effective the different constraints upon learning are in young birdsParagraph4However,not all birds show the same learning pattern as do chaffinches.There are some species which produce normal sounds even if deaf,so that they cannot hear their own efforts,much less copy those of others.The cooing of doves and the crowing ofcocks are examples here.In other cases,such as parrots and hill mynahs,birds can be trained to copy a huge variety of sounds,though those they learn in the wild are usually more restricted.The amazing capability of mynahs has apparently arisen simply because birds in an area learn a small number of their calls from each other, males from males and females from females,and these calls are highly varied in structure.The ability to master them has led the birds,incidentally,to be capable of saying“hello”and mimicking a wide variety of other sounds.11.The word“restricted”in the passage is closet in meaning toimportantpopularlimitedaccurate12.According to paragraph4,why are mynahs able to learn to make a wide variety ofsounds?They have the ability to imitate any sound that they are exposed to.The frequency with which mynahs travel from one small area to another exposes them to a wide variety of sounds.They are exposed in the wild to calls that are very different from each other.An acute sense of hearing allows them to listen to and copy many different sounds.13.Look at the four squares[■]that indicate where the following sentence can beadded to the passage.Are these constraints genetic,environmental,or both?Where would the sentence best fit?Click on a square[■]to add the sentence to the passage.Paragraph3Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.■In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themselves belong.■These constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.■The crude song of a bird reared in isolation gives some clues as to what this rough idea may be: the length,the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and those reared in isolation.■In other cases the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a livetutor.In some cases this may occur when they are young birds,but in others the main learning period is when they set up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countersing with them.Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.14.Directions:An introductory sentence for a brief summary of the passage isprovided plete the summary by selecting the THREE answer choices that express the most important ideas in the passage.Some answer choices do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage.A.Although only male chaffinches are able to sing in the wild,Thorpe found that he could teach hand-reared females to copy songs from recordings and live tutors.B.Chaffinches reared in isolation produce songs that differ significantly from those of normal birds,suggesting that some social influence is important for learning a song precisely.C.Birds vary a great deal with respect to both the variety of sounds they are able to learn and the conditions that must be present for them to be able to learn their species’song.D.Chaffinches that are exposed only to other bird species for the first few weeks of their life are likely to learn the songs of those species instead of the chaffinch song.E.Researchers believe that both the circuitry or a bird’s brain and its interactions with other birds of the same species may prevent birds from learning the songs of other species.F.The ability of deaf birds to produce their normal species’song suggests that genes play a much greater role than environment in determining the behavior of most bird species.The Role of DiapauseParagraph1If conditions within an organism’s environment occasionally or regularly become harsh,it may be advantageous for an organism to have a resistant stage built into the life cycle.In such a life history strategy,the organism suspends any growth, reproduction,or other activities for a period of time so that they may occur at a later, more hospitable time.This genetically determined resting stage,characterized by the cessation of development and protein synthesis and suppression of the metabolic rate, is called diapause.Many other kinds of resting stages,with different levels of suppression of physiological activities,are known.Some of these resistant stages can be extremely long-lived.In one case,seeds of the arctic lupine,a member of the pea family recovered from ancient lemming burrows in the Arctic,germinated in threedays even though they were carbon-dated at more than10,000years old!1.According to paragraph1,why do some organisms have a resting stage during their life cycle?A.To recover from injuries suffered during harsh conditionsB.To devote all of their energy to a period of growth and reproductionC.To wait for local conditions to become favorable for important life eventsD.To prepare to move to a different environment if conditions become harsh2.Why does the author mention“seeds of the arctic lupine”？A.To argue that members of the pea family are extremely resistant to cold temperaturesB.To provide information about what ancient lemmings ate during their long resting periodsC.To provide an example of an organism with a resting stage that has many different levels of suppression of physiological activities.D.To support the claim that some resting stages last an extremely long time Paragraph2Unfavorable conditions that are relatively predictable probably pose a simpler problem for organisms than do unpredictable conditions.Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.For example,many seeds require a period of stratification,exposure to low temperatures for some minimum period,before they will germinate.This is a simple adaptation to ensure that germination occurs following the winter conditions rather than immediately prior to their onset.In contrast,unfavorable conditions that occur unpredictably pose considerable problems for organisms.In fact,unpredictability is probably a greater problem than is the severity of the unfavorable period.How can organisms cope with the unpredictable onset of good or poor conditions?3.According to paragraph2,why do many seeds require a period of stratification?A.To slowly build up a tolerance for lower and lower temperaturesB.To guarantee that the seeds grow after and not beforeC.To make sure that the seeds can deal with unpredictable conditionsD.To give the seeds enough time to germinate before winter begins4.The word“severity”in the passage is closest in meaning toA.lengthB.harshnessC.unexpectednesspletenessParagraph3Many adaptations to this general problem are based on a resting stage that awaitsfavorable conditions.We will consider two examples from the vertebrates.The first is the red kangaroo.This marsupial inhabits the deserts of central Australia where the onset of rains and the resulting sudden growth of vegetation are extremely unpredictable.Obviously,it is advantageous for a kangaroo female to produce young at a time when plant productivity is sufficient to support her offspring.For such a relatively large mammal,however,gestation(the period of development during pregnancy)is so long that if a female waited to mate and carry the young until after the rains came,the favorable period might be past.The kangaroo’s life history adaptation to this problem involves the use of embryonic diapause during gestation (development in the uterus).(第三段未直接出题，但主旨题可能考到里面的选项)Paragraph4After a31-day gestation period,the female gives birth to a tiny helplessyoung typical of marsupials.The newborn crawls into the mother’s pouch and attaches to a teat where it continues to grow and develop.After235days it leaves the pouch but remains with the mother and obtains milk from her.Two days after giving birth,the female mates again.The fertilized egg enters a204-day period of diapause during which it remains in the uterus but does not attach.It then implants,and31days later,birth of the second young occurs.Note that the first young leaves the pouch at just this time.Again,the female mates,fertilization occurs,and another diapause follows.The eventual result is that at any one time,the female has three young at various stages of development one in diapause,one in the pouch,and one outside the pouch.Among other benefits,this allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.5.According to paragraph4,all of the following statements are true about the young offspring of the red kangaroo EXCEPT:A.After birth,a newborn crawls into the mother’s pouch where it grows and develops.B.After a young kangaroo leaves its mother’s pouch,it still needs its mother’s milk.C.A mother usually gives birth to three baby kangaroos at the same time.D.A baby kangaroo spends235days in the mother’s pouch after its birth.6.Paragraph4supports all of the following statements about the red kangaroo of central Australia EXCEPT:A.A female kangaroo mates again shortly after her newborn enters her pouch.B.During diapause,a young kangaroo stays in the female’s pouch and growth of a second fertilized egg inside the uterus is delayed.C.A female kangaroo can freeze the development of her young at each stage of their development.D.The adaptation of diapause enables female kangaroos to ensure the survival of theiryoung during periods of environmental stress.7.What is the main purpose of paragraph4in the passage?A.To give the details of an adaptation mentioned in paragraph3B.To describe an adaptation different from the one explained in paragraph3C.To introduce an adaptation that is described in detail in paragraph5D.To discuss an adaptation that is not as successful as the one discussed in paragraph 5Paragraph5A similar strategy-accelerated development combined with a resting stage-has also allowed amphibians to inhabit deserts.The spadefoot toads,such as Couch’s spadefoot toad,inhabit some of the most severe deserts in North America.Adults of this species burrow deeply into the substrate where it is cooler and perhaps more moist.Here they enter into a resting state in which they are covered with a protective layer of dead skin.When it rains,the adults emerge and congregate to mate at temporary ponds.Development is greatly accelerated:the eggs hatch within48hours, and the tadpoles change into toads at16-18days.Consequently,they can complete the life cycle during the brief window of favorable conditions,then return to the resistant resting stage to await the next rainfall.Resting stages thus comprise a series of adaptations that allow the species to avoid the most difficult conditions for life.8.The word“congregate“in the passage is closest in meaning toA.beginB.gatherC.hurryD.Expect9.The word“Consequently“in the passage is closest in meaning toA.EventuallyB.In additionC.As a resultD.However10.The word“comprise”in the passage is closest in meaning toA.consist ofB.bring aboutC.are similar toD.take the place of11.According to paragraph5,how do amphibians such as spadefoot toad survive the severe heat conditions in the North American deserts?A.They dig down into the ground and go into a resistant resting state.B.They remain in the ponds that develop after it has rained.C.They lose their outer layer of skin.D.Their eggs lie dormant until the desert air becomes cooler and more moist.12.According to paragraph5,which of the following occurs during the life cycle of the spadefoot toad?A.The female’s’eggs hatch under the surface of the desert.B.The adults mate during the dry period.C.The newborn grows into an adult before unfavorable conditions.D.The newborn enters a resting stage before it becomes an adult.13.Look at the four squares[■]that indicate where the following sentence could be added to the passage.Where would the sentence best fit?Such adaptations to predictable conditions can also be made by animals,such as by hibernating during the coldest months.Unfavorable conditions that are relatively predictable probably pose a simpler problem for organisms than do unpredictable conditions.Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.For example,many seeds require a period of stratification,exposure to low temperatures for some minimum period,before they will germinate.■This is a simple adaptation to ensure that germination occurs following the winter conditions rather than immediately prior to their onset.■In contrast,unfavorable conditions that occur unpredictably pose considerable problems for organisms.■In fact,unpredictability is probably a greater problem than is the severity of the unfavorable period.■How can organisms cope with the unpredictable onset of good or poor conditions?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 the express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth2points.Some organisms adapt to periodic harsh conditions by building a resistant stage,or diapause,into their life cycle.A.The diapause stage evolved very early and is most common in species that first appeared more than10,000years ago.B.Unpredictable conditions are more problematic for organisms than are fairly predictable changes such as the seasons.C.The female red kangaroo adapts to unfavorable conditions by delaying the development of her fertilized egg until an embryo would be able to move into the pouch.D.Some seeds may germinate in three days even if they have been exposed to very low temperatures for a long time.E.Some marsupials can care for three newborns in their pouch at the same time,allowing the young to leave the pouch only when conditions are favorable for their growth.F.Some amphibians adapt to desert life by combining accelerated development with resting stages deep underground.第三篇The Plow and the Horse in Medieval Europe同2015年混编第一套中的第二篇1.Birdsong答案：CCDCC,ADBAD,CCB（BCE）2.The Role of Diapause答案：1.C2.D3.B4.B5.C6.C7.A8.B9.C10.A11.A 12.C13.B14.B C F。
TPO-27 Reading 3解析
Q1正确答案：B解析：定位到第3-4句，“naturalists widely assumed...Careful studies have demonstrated…”, 第3句说人们认为狼对鹿的数量控制起到了重要作用，第4句话说研究否定了人们的判断，B选项与原文的意思和逻辑关系对应。
文中没有wolves follow moose的意思，排除A; C与段落最后一句话矛盾; D在文中没有依据。
Q2正确答案：B解析：rebound，弹回，反弹，回升；近义词是recover, 恢复。
根据上下文的逻辑关系可以推断出词义，词汇所在句的意思是“当捕食者的数量下降，被捕食者的数量会rebound”，recover最符合句子前后的逻辑关系；也可以通过词根词缀分析rebound。
bound本来就是跳跃的意思，加re-前缀就是再次跳跃，也就是反弹。
Q3正确答案：A解析：考察理解段落意思。
题干中的实验环境下捕猎者灭绝的情况出现在第1句，但后面立刻出现了however，出现了转折。
下文叙述的内容是在提供安全环境的条件下，捕食者和被捕食者的数量可以保持一个cyclical pattern，被捕食者就不会灭绝。
所以实验环境下捕猎者灭绝的情况是并不能准确地反映真实的野外情况，A正确。
Q4正确答案：D解析：根据第三段最后一句话，排除A; 根据对第2段大意的理解，确定正常情况下捕食者是不会灭绝消失的，排除B；第三段第2句出现了ten-year cycle，但是仅是对野兔的描写，并不适用于全部哺乳动物，排除C。
根据第二段第2句，被捕食者在现实生活中可以居于安全的远离捕食者的地方，确定D正确。
Q5正确答案：C解析：roughly，大约，大致，差不多；近义词是approximately，大约。
rough 作为形容词有“不确切的，粗略的”意思，可据此推断roughly作为副词的意思。
Q6正确答案：A解析：generate，产生，引起；近义词是produce。