最新高考英语 阅读理解训练经典题目(含答案)

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最新高三英语阅读理解(人生百味)题20套(带答案)含解析

最新高三英语阅读理解(人生百味)题20套(带答案)含解析

最新高三英语阅读理解(人生百味)题20套(带答案)含解析一、高中英语阅读理解人生百味类1.阅读理解A robot created by Washington State University (WSU) scientists could help elderly people with dementia (痴呆) and other limitations live independently in their own homes.The Robot Activity Support System or RAS, uses sensors installed in a WSU smart home to determine where its residents are, what they are doing and when they need assistance with daily activities. It navigates (定位) through rooms and around obstacles to find people on its own, provides video instructions on how to do simple tasks and can even lead its owner to objects like their medication or a snack in the kitchen."RAS combines the convenience of a mobile robot with the activity detection technology of a WSU smart home to provide assistance in the moment, as the need for help is detected," said Bryan Minor, a postdoctoral researcher in the WSU School of Electrical Engineering and Computer Science.Currently, an estimated 50 percent of adults over the age of 85 need assistance with every day activities such as preparing meals and taking medication and the annual cost for this assistance in the US is nearly $2 trillion. With the number of adults over 85 expected to triple by 2050, researchers hope that technologies like RAS and the WSU smart home will relieve some of the financial strain on the healthcare system by making it easier for older adults to live alone.RAS is the first robot researchers have tried to incorporate into their smart home environment. They recently published a study in the journal Cognitive Systems Research that demonstrates how RAS could make life easier for older adults struggling to live independently."While we are still in an early stage of development, our initial results with RAS have been promising," Minor said. "The next step in the research will be to test RAS' performance with a group of older adults to get a better idea of what prompts, video reminders and other preferences they have regarding the robot."(1)How does RAS serve elderly people?A. Through sensors.B. Through objects.C. Through a mobile robot.D. Through their daily activities.(2)What can we know about RAS?A. It is the first robot used in daily life.B. Its function remains to be tested.C. It can locate people and do any task.D. It can cook for owners on its own.(3)What's Minor's attitude toward the future of RAS?A. Doubtful.B. Negative.C. Optimistic.D. Uncertain.(4)What can be a suitable title for the text?A. Elderly people leave the nursing home.B. Smart Home Tests first elder-Care robot.C. RAS, the first robot to make home smart.D. Older adults have benefited from RAS.【答案】(1)A(2)B(3)C(4)B【解析】【分析】本文是一篇说明文,介绍了一款由美国华盛顿州立大学的科学家们研发的机器人,可以帮助那些痴呆或有身体缺陷的老年人在家里过上自立的生活。

高考英语 阅读理解训练经典题目(及答案)50

高考英语 阅读理解训练经典题目(及答案)50

高考英语阅读理解训练经典题目(及答案)50一、高中英语阅读理解1.阅读理解Nhon Ly, a 55-year-old Vietnamese-born professional bodybuilder from California has been awarded the "real-life Master Roshi" for his unbelievable similarity to the popular Dragon Ball Z anime(日本动漫) character.Ly certainly doesn't look like any other typical 55-year-old man. In fact, he looks a lot better than most guys in their 20s, with his lean(瘦且健康的), strong muscles and youthful attitude. But he's absolutely not the only 50-something man who has the strong muscle in the world. What really sets Nhon Ly apart from all the rest is his unbelievable similarity to Dragon Ball Z character Master Roshi, also known as the Turtle Hermit, in his "final form". And he apparently liked the comparison so much that he even set his Instagram handle as @master_ roshi_ real_ life.According to Madness Media, Ly immigrated to the United States in 1980, at the age of 16. He got a job as a pedicurist(修脚师) at a nail salon, and worked his way up to salon owner. Although he has achieved so much, bodybuilding has always been his biggest love. He has competed in several professional bodybuilding events, with his most notable results being the 4th place at the 2011 US Championship, the 7th place at the 2012 edition, and the 5th place at the 2015 Nationals.Even at 55, Nhon Ly continues to train hard in the gym in order to keep his Master Roshi look. He also likes to share photos and videos with his 40,000 fans, many of whom are Dragon Ball Z fans. They routinely post a large quantity of comments, thanking him for training Goku, who is the main character in Dragon Ball media, and asking him to train them in the art of bodybuilding.(1)Why is Nhon Ly called "real-life Master Roshi"?A. He looks extremely similar to Master Roshi.B. He is quite good at training people like Goku.C. He has the same life stories as Master Roshi.D. He holds a special attitude to Dragon Ball Z.(2)How does Nhon Ly feel about his "new name"?A. He finds it typical yet silly.B. He thinks it can be popular.C. He is fond of it very much.D. He considers it embarrassing.(3)Which of the following words can best describe Nhon Ly?A. Confident and wealthy.B. Creative and ambitious.C. Athletic and hardworking.D. Healthy and generous.(4)What can be a suitable title for the text?A. Success Comes From Continuous Efforts and DreamsB. Great Achievements of an Old but Still Positive AthleteC. Unbelievable Life Experiences of an Anime CharacterD. A 55-year-old Man Is Known for Looking Like Master Roshi【答案】(1)A(2)C(3)C(4)D【解析】【分析】本文是一篇记叙文,55岁的职业健美运动员尼汉·莱因其与流行的《龙珠Z》中的动画人物龟仙人看起来相像而被授予“现实生活版的龟仙人”的称号。

高考英语 阅读理解训练经典题目(附答案)

高考英语 阅读理解训练经典题目(附答案)

高考英语阅读理解训练经典题目(附答案)一、高中英语阅读理解1.阅读理解Babies born in summer are more likely to become short-sighted in late life, a study has shown. As many as a quarter of all cases of short-sightedness are caused by too great an exposure to sunlight in the first weeks of life, say eye experts.They are advising all parents to put sunglasses on their babies during the first weeks. Scientists had already established that over-exposure to sunlight caused shortsightedness in animals.Researchers who compared the months in which babies were born with whether they needed glasses later on say the principle also applies to humans.A study of almost 300, 000 young adults-the largest of its kind-showed that those born in June and July had a 25 per cent greater chance of becoming severely short-sighted than those born in December or January.Research leader Professor Michael Belkin, of Tel Aviv University, said it was because prolonged illumination(光照) causes the eyeball to lengthen-causing short-sightedness.Hence the more light a newborn is exposed to, the more the eyeball lengthens and the worse the short-sightedness will be.The mechanism which lengthens the eyeball is associated with levels of melatonin(褪黑激素), a pigment (色素) which protects the skin against harmful rays of the sun.In young babies not enough melatonin is released as protection, meaning they are more vulnerable to sunburn and changes to eyeball shape.Sight expert Professor Daniel O'Leary, of Anglia Ruskin University in Cambridge, said "At the moment we don't know the precise cause of why light exposure affects sight, but the evidence seems to prove that it is one of the reasons for people becoming shortsighted."(1)Babies born in summer are more likely to be shortsighted ____________.A. because the summer sun is too strong for babiesB. because babies born in summer have lengthened eyeballsC. if they are exposed too much sunlight in the first weeks after they are born D if parents don't know a proper way to protect their babies' eyes(2)Melatonin is a kind of material to ___________.A. prevent the eyes from becoming near-sightedB. protect the skin from harmful sun raysC. make our body strongD. protect babies' eyes from summer sun(3)From what Professor Daniel O'Leary says we can conclude that ___________.A. there is no evidence that shortsightedness is related to exposure to sunlightB. whether light exposure affects sight still needs to be further provedC. he believes that light exposure can cause shortsightednessD. he tries to give the cause of why light exposure affects sight(4)The underlined word "vulnerable" in the passage probably means __________.A. easy to be harmedB. resistantC. protectiveD. changeable【答案】(1)C(2)B(3)C(4)A【解析】【分析】本文是一篇说明文,研究表明在夏季出生的婴儿长大后更容易成为近视眼,眼科专家称多达四分之一的近视眼病例是由于在出生后前几周里暴露阳光太久造成。

(英语)高考英语阅读理解题20套(带答案)含解析

(英语)高考英语阅读理解题20套(带答案)含解析

(英语)高考英语阅读理解题20套(带答案)含解析一、高中英语阅读理解1.阅读理解Durian(榴莲) is probably the smelliest fruit in the world, letting out an unusual unpleasant smell which would make anyone bring up. However, nobody was aware of what gave this fruit its unique smell, so a team of researchers from Singapore decided to take a look at its genome (基因组) and find out,Durian is well-known throughout Southeast Asia as the king of fruits, mostly because of its awful appearance and smell. However, the origin of this unpleasant smell was unknown, so researchers decided to map the genome of the fruit, and find the gene that controlled it. A group of genes, volatile sulfur compounds (含硫化合物), became very active in the fruit, and they were found responsible for resulting in the unpleasant smell.The fruit confuses everyone with a sulfuric smell, like rotten onions and ingredients. The smell lasts long, mostly because the fruit contains more volatile sulfur compounds. Other species usually benefit from two gene copies at most, but durian has four, leading to the striking smell.However, this smell might be an advantage for durian in the wild. Although we find it unpleasant, many animals might be attracted by it. If they eat the fruit, then they can easily spread its seeds everywhere, thus contributing to the distribution of the species.The mapping of the durian genome also showed some other information on the species. First of all, the fruit has an impressive number of genes, namely 46,000. Also, with the help of these genes, they saw how it evolved, and discovered it was related to the cacao tree. All the other discoveries have been published in the journal Nature Genetics.Despite the striking smell, many people actually enjoy eating the fruit. However, not all durian species are edible, and some of them may even cause damage to our health, Even so, the fruit is often imported, significantly contributing to the economy.(1)What give durian its unique smell?A. Onions nearby.B. Two gene copies.C. Rotten ingredients in it.D. Volatile sulfur compounds.(2)What does the underlin ed word “evolved” in Paragraph 5 probably mean?A. Developed.B. Escaped.C. Predicted.D. Tolerated.(3)What can we infer from the text?A. No birds enjoy eating durian.B. Durian can be planted all over the world.C. Some of durian species can not be eaten.D. Durian has no relationship with the cacao tree.(4)What's the best title for the text?A. What's Durian?B. The Influence of the SmellC. The Distribution of DurianD. The Mystery of the Unpleasant Smell of Durian 【答案】(1)D(2)A(3)C(4)D【解析】【分析】本文是一篇说明文,新加坡的研究者找出导致水果有难闻气味的原因就是水果中含有的挥发性硫化合物非常活跃,这种气味对于野外生存榴莲来说有利于吸引动物来吃这种水果,同时传播种子。

最新高考英语 阅读理解训练经典题目(及答案)

最新高考英语 阅读理解训练经典题目(及答案)

最新高考英语阅读理解训练经典题目(及答案)一、高中英语阅读理解1.阅读理解Most of us have looked up at the stars that fill the night sky and wondered whether we're alone in the universe. Indeed, the question of whether there's life out there has been something humankind's been asking itself for countless years. But thanks to China's Five-hundred-meter Aperture Spherical Telescope (FAST), the answer to this question may come a lot sooner than we expected.The telescope has a huge round reflector, which measures 500 meters across and has a perimeter(周长)of 1.6 kilometers. Because of its great size, it would have been both difficult and inefficient to get FAST to move like a regular telescope. Instead, FAST's designers came up with a great solution: its surface is made up of 4450 panels which can be individually adjusted. This clever design feature allows scientists to detect radio signals from any angle with a great degree of accuracy. "Panels can change their positions through connected wires and parallel (关联的) robots. We can control their position with an accuracy of 1mm," Zheng Yuanpeng, chief engineer of the telescope's panel project, told Xinhua News Agency.FAST's engineers also had the task of finding a suitable location. As any interference would affect its ability to detect distant radio waves, it needed to be built in a remote area. Luckily, the perfect spot was found in the beautiful mountains of Guizhou Province. "There are three hills about 500 meters away from one another, creating a valley that is perfect to support the telescope," Sun Caihong, chief engineer of FAST's construction, told Xinhua.And although it wasn't yet fully operated, FAST had already made great discoveries by October 2017. Since 1967, only around 2000 pulsars (脉冲星) have been discovered, yet FAST had detected six more by October 2017. Once FAST is fully up and running, we may finally have the answer to one of the biggest questions in history.(1)What is the purpose of mentioning the question in Paragraph 1?A. To introduce the new giant telescope.B. To explain why there is life in universe.C. To remind readers to think about the life in space.D. To emphasize the question that should be answered.(2)What can we know from Paragraph 2?A. The telescope is made up of many panels.B. The area of FAST is about 800 square kilometers.C. The engineer can handle FAST's position accurately.D. The individual panel helps scientists catch radio signals.(3)Why was FAST built in Guizhou?A. Because Guizhou is a remote province.B. Because Guizhou has an ideal valley.C. Because Guizhou has beautiful mountains.D. Because Guizhou has the ability to build it.(4)What does the last paragraph mainly talk about?A. FAST's timeline.B. FAST's future.C. FAST's operation.D. FAST's discoveries.【答案】(1)A(2)D(3)B(4)D【解析】【分析】本文是一篇说明文,介绍了中国500米口径球面射电望远镜,它的设计原理、选址以及发展前景等多方面的信息。

高考英语阅读理解训练附参考答案

高考英语阅读理解训练附参考答案

高考英语阅读理解训练附参考答案高考英语阅读理解训练1:Life in the ClearTransparent animals let light pass through their bodies the same way light passes through a window.These animals typically live between the surface of the ocean and a depth of about 3,300 feet—as far as most light can reach.Most of them are extremely delicate and can be damaged by a simple touch.Sonke Johnsen, a scientist in biology, says, “These animals live through their life alone.They never touch anything unless theyre eating it, or unless something is eating them.”And they are as clear as glass.How does an animal become seethrough? Its trickier than you might think.The objects around you are visible because they interact with light.Light typically travels in a straight line.But some materials slow and scatter(散射)light, bouncing it away from its original path.Others absorb light, stopping it dead in its tracks.Both scattering and absorption make an object look different from other objects around it, so you can see it easily.But a transparent object doesnt absorb or scatter light, at least not very much. Light can pass through it without bending or stopping.Thatmeans a transparent object doesnt look very different from the surrounding air or water.You dont see it—you see the things behind it.To become transparent, an animal needs to keep its body from absorbing or scattering light.Living materials can stop light because they contain pigments(色素) that absorb specific colors of light.But a transparent animal doesnt have pigments, so its tissues wont absorb light.According to Johnsen, avoiding absorption is actually easy.The real challenge is preventing light from scattering.Animals are built of many different materials—skin, fat, and more —and light moves through each at a different speed.Every time light moves into a material with a new speed, it bends and scatters.Transparent animals use different tricks to fight scattering.Some animals are simply very small or extremely flat.Without much tissue to scatter light, it is easier to be seethrough.Others build a large, clear mass of nonliving jellylike(果冻状的)material and spread themselves over it.Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light exactly as much as water does.They need to look uniform.But how theyre doing it is still unknown.One thing is clear:for these larger animals, staying transparent is an active process.When they die, they turn a nontransparent milky white.*大意:你见过透明生物吗?*介绍了透明的海洋生物。

高考英语 阅读理解训练经典题目(及答案)

高考英语 阅读理解训练经典题目(及答案)

高考英语阅读理解训练经典题目(及答案)一、高中英语阅读理解1.阅读理解As winter set in, it's the perfect time to get out of town and escape the seasonal mood disorder. Here are vacation ideas to adopt now.Costa RicaCosta Rica, located in the Valle del General, is an off-the-radar agriculture town that's not overrun with tourists. The area is known for its coffee, pineapples and sugar cane plantations, as well as its rich forests. What's more, you can enjoy horseback riding, spend afternoons at the spa or tour a nearby wildlife shelter to look out for colorful birds, sloths and other animals.Los Cabos, MexicoIf you love wine, travel to Los Cabos, a beautiful vacation destination at the southern edge of the Baja Peninsula. During your getaway, you can enjoy special wine tastings and dinner cooked by Los Cabos's Michelin-starred chef. There are wildlife-viewing opportunities, too. From December through May, you can spot whales, manta rays and more wildlife.Petit St Vincent, the GrenadinesThis private Caribbean island was spared the anger of hurricanes Irma and Maria. What's more, the whole island is only 115 acres and has 22 cottages. Each cottage is located in a quiet place, and you can expect to unplug and recharge phones with no wireless connections, televisions or telephones in the cottages. Even better, you can spend your days admiring fascinating marine (海洋的) life at the Jean-Michel Cousteau Diving Caribbean center.The Exumas, BahamasOn Fowl Cay's 50-acre private island, you can enjoy a carefree escape. Days can be spent fishing, boating and diving before wandering along white sands. The resort features large one-, two- and three-bedroom houses. Best of all, if you're planning a group getaway or multigenerational trip, you rent the entire island for a one-of-a-kind island escape.(1)Why does the author recommend these places to readers?A. To escape from extreme weather.B. To experience out-of-town sights.C. To beat winter blues.D. To treat mental diseases.(2)What do we know about Petit St Vincent?A. It suffered from Irma and Maria.B. It's a huge and quiet island.C. People can admire fish off shore.D. People can charge phones using wireless connections(3)Where can Tom best go with his grandparents and parents?A. Los Cabos, Mexico.B. Petit St Vincent, the Grenadines.C. Costa Rica.D. The Exumas, Bahamas.【答案】(1)D(2)C(3)D【解析】【分析】本文是一篇应用文,介绍了冬天来临之时,适合外出度假的一些地点。

【英语】高考英语阅读理解题20套(带答案)含解析

【英语】高考英语阅读理解题20套(带答案)含解析

【英语】高考英语阅读理解题20套(带答案)含解析一、高中英语阅读理解1.阅读理解A bite from a tsetse fly (采采蝇) is an extremely unpleasant experience. It is not like a mosquito, which can put its thin mouthpart directly into your blood, often without you noticing. In contrast, the tsetse fly's mouth has tiny saws on it that saw into your skin on its way to suck out your blood. To make matters worse, several species of tsetse fly can transmit diseases. One of the most dangerous is a parasite that causes "sleeping sickness", or "human African trypanosomiasis"to give it its official name. Without treatment, an infection is usually fatal.Like so many tropical diseases, sleeping sickness has often been neglected by medical researchers. However, researchers have long endeavored to understand how it avoids our bodies' defence mechanisms. Some of their insights could now help us eliminate sleeping sickness altogether.There are two closely-related single-celled parasites that cause this deathly sleep: Trypanosoma brucei rhodesiense and T. b. gambiense. The latter is far more common: it is responsible for up to 95% of cases, mostly in western Africa. It takes several years to kill a person, while T. brucei rhodesiense can cause death within months. There are still other forms that infect livestock.After the initial bite, sleeping sickness symptoms often start with a fever, headaches and aching muscles. As the illness goes on, those infected become increasingly tired, which is where it gets its name. Personality changes, severe confusion and poor coordination can also happen.While medication does help, some treatments are toxic and can themselves be deadly, especially if they are given after the disease has reached the brain.It is worth noting that sleeping sickness is no longer as deadly as it once was. In the early 20th Century several hundred thousand people were infected each year. By the 1960s the disease was considered "under control"and had reached very low numbers, making its spread more difficult. But in the 1970s there was another major epidemic, which took 20 years to control.Since then, better screening programmes and earlier interventions have reduced the number of cases dramatically. In 2009 there were fewer than 10,000 cases for the first time since records began, and in 2015 this figure dropped to fewer than 3,000, according to the latest figures from the World Health Organisation. The WHO hopes the disease will be completely eliminated by 2020.While this decline looks positive, there may be many more cases that go unreported in rural Africa. To eliminate the disease completely, infections have to be closely monitored.More problematically, a series of new studies have shown that the parasite is more complicated than previously believed.Sleeping sickness has always been considered ——and diagnosed ——as a blood disease, because T. brucei parasites can readily be detected in the blood of its victims.(1)A tsetse fly is different from a mosquito in that________.A. it can put its thin mouthpart directly into your bloodB. all species of tsetse fly can transmit diseasesC. it can spread a parasite that causes "sleeping sickness"D. its mouth has larger saws than those on a mosquito(2)What can be learned about "sleeping sickness" according to the text ?A. It is formally called"human American trypanosomiasis".B. If left untreated, it can possibly be deadly.C. It remains as deadly as it used to be.D. It usually draws attention from medical researchers.(3)What is implied in the last three paragraphs ?A. "Sleeping sickness" will be completely eliminated by 2020.B. The parasite causing "sleeping sickness" is easy to detect now.C. T. brucei parasites can only be detected in the blood of its victims.D. Data about "sleeping sickness"cases may not be so accurate.(4)What would be the best title of this passage ?A. A mosquito that can carry deadly diseases.B. A bite from this fly puts you into a deadly sleep.C. Symptoms that are characteristic of "sleeping sickness".D. How to control deadly"sleeping sickness" from a tsetse fly.【答案】(1)C(2)B(3)D(4)B【解析】【分析】本文是一篇说明文,作者介绍了70年代被采采蝇咬伤很容易感染疾病,传播病菌,一定要小心。

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最新高考英语阅读理解训练经典题目(含答案)一、高中英语阅读理解1.阅读理解To ensure an excellent experience during your tour of the Mark Twain House, here are some guidelines and general information:The House is Shown Only by Guided Tour.To ensure an optimum (最佳) experience, house tours are limited to 14 people, first-come, first-served. If your group has more than 10 people, call (860) 280-3130 to reserve a discounted group tour in advance of your visit. If you have a party of fewer than 10 people feel free to purchase tickets online: We will hold them at Will Call. The tour schedule is usually online about a month in advance.Our site is made up of three buildingsThe Webster Bank Museum Center at the Mark Twain House & Museum is always your first and last stop as it houses our ticket counter, museum store, film, exhibits and cafe. All tours gather in the museum center before heading over to Mark Twain's historic 1874 home. Mark Twain's historic carriage house is the third building on our property, but is generally not open to the public. The hayloft (干草棚) has been repurposed into offices and the main floor of the barn is a space available for rent for parties and meetings.Coupons & DiscountsThe Mark Twain House offers only a few coupons and discounts. The price you pay for admission helps us maintain the beauty of this icon of American architecture. If you are lucky enough to find one of those special offers online or at your local library, keep in mind they are good only for the general Mark Twain House Tours. No passes or discounts may be applied to our specialty tours.(1)What kind of tour booked beforehand enjoys a discount?A.Specialty tour.B.Guided tourC.Group tour with 9 people.D.Group tour with 13 people.(2)Which place is not available to tourists?A.The Webster Bank Museum Center.B.Mark Twain's historic carriage house.C.The hayloft.D.Mark Twain's historic 1874 home.(3)What is the purpose of charging admission fees?A.To earn more money.B.To well preserve the house.C.To support Mark Twain's family.D.To offer parties and meetings.【答案】(1)D(2)B(3)B【解析】【分析】本文是一篇应用文,介绍了参观马克·吐温故居的指南和信息。

(1)考查推理判断。

根据The House is Shown Only by Guided Tour.部分中的 "If your group has more than 10 people, call (860) 280-3130 to reserve a discounted group tour in advance of your visit."可知,如果您的团体人数超过10人,请在您参观之前致电(860)280-3130预订折扣的团体游,可知,13人旅行团提前预定可以享受折扣,故选D。

(2)考查细节理解。

根据Our site is made up of three buildings部分中的"Mark Twain's historic carriage house is the third building on our property, but is generally not open to the public."可知,马克·吐温的马车屋是不对游客开放的,故选B。

(3)考查细节理解。

根据Coupons & Discounts部分中的"The price you pay for admission helps us maintain the beauty of this icon of American architecture."可知,你们的入场费用帮助我们保持这个美国标志性建筑——马克·吐温故居的美丽,可知,收取入场费的目的是保护好马克·吐温故居,故选B。

【点评】本题考点涉及细节理解和推理判断两个题型的考查,是一篇介绍类阅读,考生需要准确捕捉细节信息,并根据上下文进行逻辑推理,从而选出正确答案。

2.(2019•天津)阅读理解How does an ecosystem(生态系统)work? What makes the populations of different species the way they are? Why are there so many flies and so few wolves? To find an answer, scientists have built mathematical models of food webs, noting who eats whom and how much each one eats.With such models, scientists have found out some key principles operating in food webs. Most food webs, for instance, consist of many weak links rather than a few strong ones. When a predator(掠食动物)always eats huge numbers of a single prey(猎物), the two species are strongly linked; when a predator lives on various species, they are weakly linked. Food webs may be dominated by many weak links because that arrangement is more stable over the long term. If a predator can eat several species, it can survive the extinction(灭绝)of one of them. And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover. The weak links may thus keep species from driving one another to extinction.Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems. In the 1960s, scientists proposed that predators at the top of a food web had a surprising amount of control over the size of populations of other species---including species they did not directly attack.And unplanned human activities have proved the idea of top-down control by top predators to be true. In the ocean, we fished for top predators such as cod on an industrial scale, while on land, we killed off large predators such as wolves. These actions have greatly affected the ecological balance.Scientists have built an early-warning system based on mathematical models. Ideally, thesystem would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline. Prevention is key, scientists says because once ecosystems pass their tipping point(临界点), it is remarkably difficult for them to return.(1)What have scientists discovered with the help of mathematical models of food webs?A. The living habits of species in food webs.B. The rules governing food webs of the ecosystems.C. The approaches to studying the species in the ecosystems.D. The differences between weak and strong links in food webs.(2)A strong link is found between two species when a predator______.A. has a wide food choiceB. can easily find new preyC. sticks to one prey speciesD. can quickly move to another place(3)What will happen if the populations of top predators in a food web greatly decline?A. The prey species they directly attack will die out.B. The species they indirectly attack will turn into top predators.C. The living environment of other species will remain unchanged.D. The populations of other species will experience unexpected changes.(4)What conclusion can be drawn from the examples in Paragraph 4?A. Uncontrolled human activities greatly upset ecosystems.B. Rapid economic development threatens animal habitats.C. Species of commercial value dominate other species.D. Industrial activities help keep food webs stable.(5)How does an early-warning system help us maintain the ecological balance?A. By getting illegal practices under control.B. By stopping us from killing large predators.C. By bringing the broken-down ecosystems back to normal.D. By signaling the urgent need for taking preventive action.【答案】(1)B(2)C(3)D(4)A(5)D【解析】【分析】本文是一篇说明文,介绍了借助食物网的数学模型,科学家们发现了一些在食物网运营的关键原则。

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