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提问人：网友lstart 发布时间：2022-01-06

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听力原文：（32)Scientists have discovered that plants themselves produce many poisonous chem

听力原文： (32)Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them. Guess how many years have the insects been eating plants. The number itself will scare you. (33) In fact, insects have been eating plants for as many as 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.

What should be done？ Scientists studying the problem suggest (34) that farmers use less insecticides. At the moment, farmers (34)regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, (34)farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.

The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.

(35) Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.

(33)

A．Insects have developed some sort of resistance to man-made poisons.

B．Insects have been eating plants for about 250 million years.

C．Farmers sometimes use a combination of two or three insecticides at once.

D．New insects mate with insecticide-surviving insects.

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更多“听力原文：（32)Scientists have discovered that plants themselves produce many poisonous chem”相关的问题

第1题

听力原文：A few months ago, [32] a team of interviewers were sent to schools to find out wh

听力原文： A few months ago, [32] a team of interviewers were sent to schools to find out why children are prejudiced against science. Their answer provided this surprising picture of a typical scientist: they thought [33] a scientist is a rather dull person who spends all day working in a laboratory, wearing a white coat and making things that smell bad. They thought that scientists usually aren't very interesting and don't talk about anything but science. They don't play games well and they aren't attractive to the opposite sex. They also did not realize that women are as capable of becoming scientists as men.

On the other hand, [34] an art graduate is seen as a much livelier person. Arts graduates are thought to have a better sense of humor, to be interested in sports and pop music and to be considered attractive. When you understand these misconceptions which children have, it is only logical that most of them want to study arts rather than science.

(33)

A．Scientists.

B．Art graduates.

C．Children.

D．Women.

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第2题

听力原文：Do you have a tough math test coming up？ Then listen to some classical piano musi

听力原文： Do you have a tough math test coming up？ Then listen to some classical piano music just before the test. You might end up with a higher score (30) . Researchers at a university in California conducted an experiment. They asked a group of college students to listen to some piano music by a famous 18 th century composer before taking a math test. They were surprised to find that the students' scores jumped 8 to 9 points. The music seems to excite nerve activities in the brain (31) ; similar to the activity that occurs when a person is figuring out a math problem. However, the scientists warn that before you get too excited about applying this method to your math test, you should remember that brain-exciting effects lust only 10 to 15 minutes (32) . Would rock music work as well as the piano music do？ No, the scientists say. In fact, the less complex music might even interfere with the brains' reasoning ability.

(31)

A．How to improve your reasoning ability.

B．Why classical music is popular with math students.

C．The difference between classical music and rock music.

D．The effects of music on the results of math tests.

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第3题

听力原文：Not only farmers but also scientists have studied weather forecasting. People for

听力原文： Not only farmers but also scientists have studied weather forecasting. People for many centuries and in all countries have studied the weather and tried to make weather forecast. Sometimes distant objects such as hills and tall trees seem to be very clear and near. This is a sign of much water in the air, and therefore rain will probably come. When distant sounds, such as noise from a train, birds singing, people shouting, are very clearly heard, then wet and stormy weather is on the way. (30)Some birds, particularly swallows, fly high if fine weather is coming, but they fly very near the ground if rainy weather or a storm is on the way. This is because probably the insects, which they are hunting, then fly low. (31)If you see a rainbow during rainy weather, this is a sign that the weather will clear up and become fine. Such rainbows always come in the evening. If the stars twinkle-clearly at night, then fair weather will continue. If a mist appears in the early morning, just about sunrise, then the day will be warm. If the sunset is mostly red in color, then the following day will be fine. When big clouds disappear at sunset, then the weather will follow on the next day. (32)If a rainbow appears in the morning, then rainy weather will probably come. Most of the above sayings have been made up by people who have used their eyes and their brains to forecast the weather.

(30)

A．Because both farmers and scientists try to make weather forecast.

B．Because people in all countries make weather forecast.

C．Because it is easy to make weather forecast.

D．Because he wants to make it clear how important to make weather forecast.

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第4题

听力原文：Thirty-two people watched Kitty Genovese being killed fight beneath their windows

听力原文： Thirty-two people watched Kitty Genovese being killed fight beneath their windows. She was their neighbor. Yet none of the 32 helped her. No one even called the police. Was it lack of feeling about one's fellow man？

"Not so," say scientists John Barley and Bib Fatane. These men went beyond the headlines to look for the reasons why people didn't act. They found that a person has to go through two steps before he can help.

First he has to notice that it is an emergency. Suppose you see some smoke. Is the smoke coming into the room from a leak in the air conditioning？ Is it "steam pipes"？ Or is it really smoke, from a fire？ It's not always easy to tell if you are faced with a real emergency.

Second, and more important, the person faced with an emergency must feel personally responsible. He must feel that he must help, or the person won't get the help.

Tests show that in a group, Americans often fail to act. They feel that others will act. They, themselves, needn't. They do not feel any direct responsibility.

Are people bothered by situations where people are in trouble？ Yes, scientists found that the people were emotional, they sweated, they had trembling hands. They felt the other person's trouble. But they did not act. They were in a group. Their actions were shaped by the actions of those they were with.

(30)

A．To explain why people fail to act in emergencies.

B．To explain when people will act in emergencies.

C．To explain what people will do in emergencies.

D．To explain how people feel in emergencies.

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第5题

听力原文：Among global warming's most frightening threats is the prediction that the polar

听力原文： Among global warming's most frightening threats is the prediction that the polar ice-caps will melt, raising sea level so much that coastal cities from New York to Los Angles to Shanghai will be flooded.

Scientists agree that key player in this scenario is the West Antarctic ice sheet, a Brazil-size mass of frozen water that is as much as 7, 000 feet thick. Unlike floating ice shelves which have little impact on sea level when they break up, the ice sheet is anchored to bedrock well blow the sea surface. Surrounded by open ocean, it is also vulnerable, but Antarctic experts disagree strongly on just how unstable it is.

Now, new evidence reveals that all or most of the west Antarctic ice sheet collapsed at least once during the past 1. 3 million years, a period when global temperatures probably were not significantly higher than they are today. And the ice sheet was assumed to have been stable. In geological time, a million years is recent history. The proof, which was published last week in Science, comes from a team of scientists from Uppsala University in Sweden and the California Institute of Technology who drilled deep holes near the edge of the ice sheet. Within samples collected from the solid substance lying beneath the ice,they found fossils of microscopic marine plants which suggest that the region was once an open ocean, not solid ice. As Herman Englehart, a co-author from the California Institute of Technology says, "the West Antarctic ice sheet disappeared once, and can disappear again. "

26. Q: What is one of the most frightening threats of global warming according to the passage？

27. Q:What did scientists disagree on？

28. Q:What does the latest information reveal about the West Antarctic ice sheet？

29. Q:What does the scientists' latest finding suggest？

(32)

A．The whole Antarctic region will be submerged.

B．Some polar animals will soon become extinct.

C．Many coastal cities will be covered with water.

D．The earth will experience extreme weathers.

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第6题

听力原文：If the population of the Earth goes on increasing at its present rate, there will

听力原文： If the population of the Earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on Earth will make it necessary for us to look for open space somewhere else.

An American scientist, Professor Cart Sagan, believes that before the earth's resources are completely exhausted, it will be possible to change the atmosphere of Venus and so create a new world almost as large as Earth itself. The difficulty is that Venus is much hotter than the Earth and there is only a tiny mount of water there.

Sagan proposes that algae, an organism that can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon.

When the algae have done their work, the atmosphere will become cooler but before man can set foot on Venus, it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like Earth will be reproduced on Venus.

(32)

A．The way to ensure the survival of the human race on Venus.

B．The way to breed organisms on Venus.

C．The way to reduce the population of the Earth.

D．The way to conquer the universe.

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第7题

听力原文：A man is in his best shape in the decade before age 25 when his muscles are firme

st, his resistance to colds and infections is highest and his body is most efficient in utilizing nutrients. For reasons that scientists do not understand, women get a five-year bonus.

Scientists do not understand why women should outlive men by five years.

A．正确

B．错误

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第8题

听力原文：U.S. scientists discovered that the soft orange glow of a common Caribbean coral

comes not from the corm itself but from bacteria that live inside it. And the bacteria not only give the coral a little nightlight, but they also break down seawater to help nourish the coral.

According to the U.S. scientists, the bacteria giving the soft orange glow prevents the seawater from nourishing the coral.

A．正确

B．错误

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第9题

听力原文：Demand for specialized technical skills has long exceeded the supply of native-bo

rn workers with advanced degrees, and scientists and engineers from other countries fill this gap.

(25)

A．Supply of native-born scientists and engineers exceeded the demand.

B．Scientists and engineers in other countries have specialized technical skills.

C．Foreign scientists and engineers help to meet the domestic demand.

D．Supply of native-born scientists and engineers can meet the demand.

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第10题

听力原文：（32)Why do we cry？ Can you imagine life without tears？Not only do tears keep your

听力原文： (32)Why do we cry？ Can you imagine life without tears？

Not only do tears keep your eyes lubricated, they also contain a substance that kills certain bacteria so they can't infect your eyes. Give up your tears, and you'll lose this on-the-spot defense.

Nor would you want to give up the flood of extra tears you produce when you get something physical or chemical in your eyes. Tears are very good at washing this irritating Stuff out.

Another thing you couldn't do without your tears is cry—from joy, anger, or sadness.

(35)Humans are the only animals that produce tears in response to emotions. And most people say a go0d cry makes them feel better.

(33)Many scientists, therefore, believe that crying somehow helps us cope with emotional situations. Tear researcher, William Frey, is trying to figure out how it happens.

One possibility, he says, is that tears discharge certain chemicals from your body, which build up during stress. "When people talk about 'crying it out', I think that might actually be what they are doing," he says.

If Frey is right, what do you think will happen to people who restrain their tears？ (34)Boys, for example, cry only about a quarter as often as girls once they reach their teenage years. And we all cry a lot less now than we did as babies.

Could it possibly be that we face less stress？ Maybe we've found other ways to deal with it. Or maybe we just feel embarrassed.

(33)

A．Why people hold back their tears.

B．Why people cry.

C．How to restrain one's tears.

D．How tears are produced.

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