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听力原文：Scientists in the United States have reported some good news about the ozone in t

听力原文： Scientists in the United States have reported some good news about the ozone in the atmosphere. Recent findings suggest that the destruction of ozone by pollution is slowing. Ozone is a form. of oxygen. Its presence above Earth protects us from radiation from the sun.

In one study, researchers examined information gathered by NASA space agency satellites and by equipment on Earth and said the atmosphere was losing about eight percent of the ozone layer per ten- year period since the late 1970s. In the last five years, though, that rate of loss has dropped by half. The atmosphere should start to gain ozone before long. A full recovery, however, is about 50 years away, as long as the Montreal Protocol remains in place.

That is an international treaty from 1987 to restore the ozone layer. The treaty restricts the use of a number of chemicals that destroy ozone, like chlorofiuorocarbons, or C-F-C's. Wide use of C-F-C's began in the 1930s. They became popular coolants in devices such as refrigerators and air conditioners. C-F-C's remain in the atmosphere for years.

The Montreal Protocol also restricts the use of methyl bromide, a chemical to kill insects. Farmers and shippers are the main users. Natural sources of methyl bromide include oceans and some plants. Scientists say the bromine gas it produces is 50 times more destructive to ozone than chlorine gas from C-F-C's.

(30)

A．The destruction process of ozone layer is slowing down.

B．The ozone layer has been destroyed seriously.

C．Ozone layer can protect us from strong radiation from the sun.

D．Ozone is produced by waste gas.

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发布时间：2020-10-14

更多“听力原文：Scientists in the United States have reported some good news about the ozone in t”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 why

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：A team of scientists recently began a project to measure the effects of loud nois

听力原文： A team of scientists recently began a project to measure the effects of loud noises on sea animals. If the sounds don't harm the animals, then the researchers can go ahead with a plan to transmit sound waves through the Pacific Ocean to take the earth's temperature. Sound travels faster through warm water than cold water. By analyzing the speed of sound through the ocean over time, the scientists will be able to determine if cur planet is warming up. The experiment was nearly cancelled more than a year ago because environmental groups fear that the sound will confuse or harm sea-animals. So scientists are conducting tests on the animals first. The researchers lowered a loud speaker that emits low frequency sound about 1,000 meters beneath the ocean. Scientists at the site transmit sound waves into the ocean. Radio transmitters attached to some of the sea animals help the researchers keep track of the animals' movements. If sea-animals are distressed by the sounds, they would swim away from the speakers. So far, there aren't any signs that the animals are being harmed. Researchers at the site noticed that large numbers of sea-animals swim near the speaker whether it was turned on or off, but it is still too soon to know for sure, the scientists admit. The test will continue through September. "If all goes well," they say, "we can begin measuring temperature changes on our planet."

(33)

A．To determine whether the Earth's temperature is going up.

B．To study the behavior. of some sea animals.

C．To measure the depths of the ocean.

D．To measure the movement of the ocean.

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第3题

听力原文：Today I'd like to mention an interesting television program that will be shown on

听力原文： Today I'd like to mention an interesting television program that will be shown on October 10th. It's about the brain. It's a new public television show produced in New York City. The program will investigate how the brain functioned and new functions. Some interesting topics that will be discussed are dreaming, memory, and depression. These topics will be illustrated by using computer imitations of the brain to make explanation easy to follow. The show is not for children. But don't worry. It's not intended for scientists either. I think the program will be very helpful with the work we're doing in class on the brain. I hope you'll watch it. Remember it's on October 10th.

(35)

A．A computer specialist.

B．A scientist.

C．A television announcer.

D．A teacher.

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第4题

听力原文：American scientist Lawrence Witmer of Ohio University in Athens, Ohio has found t

听力原文： American scientist Lawrence Witmer of Ohio University in Athens, Ohio has found that many images of dinosaurs may be wrong. For years, pictures of the ancient creatures have shown their nose openings near the top of the head. The new study suggests the dinosaurs' nostrils were just above the mouth.

Dinosaurs used their nostrils to breathe, smell and control their body temperature. The new theory could help explain how the huge creatures were able to survive by using their sense of smell to find food, a mate and possible enemies.

Many of the early dinosaur remains recovered by scientists were from huge creatures called sauropods. Scientists believed that sauropods must have lived in water because their bodies were so huge and their necks were so long.

Nostrils high on the head would have permitted the dinosaurs to breathe while partly under water. The discovery of a sauropod head bone in 1884 added support for this belief. The skull had a large hole at the top of the head.

Professor Witmer found that the hole scientists once thought was a nostril in dinosaurs is just one part of the larger nasal passage. He found that the nostrils were farther forward and closer to the mouth. He says this new nostril position was hue for all dinosaurs.

(30)

A．Biology textbook.

B．Scientific essay.

C．Science fiction.

D．Science report.

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第5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6题

听力原文：Many people catch a cold in the spring time or fall. It makes us wonder: if scien

听力原文： Many people catch a cold in the spring time or fall. It makes us wonder: if scientists can send a man to the moon, [33] why can't they find a cure for the common cold？ The answer is easy. There're actually hundreds of kinds of cold viruses out there. You never know which one you will get, so there isn't a cure for each one. When a virus attacks your body, your body works hard to get rid of it. Blood rushes to your nose and causes a blockage in it. You feel terrible because you can't breathe well, but your body is actually eating the virus. Your temperature rises and you get a fever, but the heat of your body is killing the virus. You also have a running nose to stop the virus from getting into your cells. [34] You may feel miserable, but actually y9ur wonderful body is doing everything it can to kill the cold. Different people have different remedies for colds. In the United States and some other countries, for example, people might eat chicken soup to feel better. Some people take hot bath and drink warm liquids. Other people take medicines to relieve various symptoms of colds. There is one interesting thing to note. [35] Some scientists say taking medicines when you have a cold is actually bad for you. The virus stays in you longer, because your body doesn't develop a way to fight it and kill it.

(30)

A．They haven't devoted as much energy to medicine as to space travel.

B．There are too many kinds of cold viruses for them to identify.

C．It is not economical to find a cure for each type of cold.

D．They believe people can recover without treatment.

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第7题

听力原文：When Iraqi troops blew up hundreds of Kuwaiti oil wells at the end of the Gulf Wa

听力原文： When Iraqi troops blew up hundreds of Kuwaiti oil wells at the end of the Gulf War, scientists feared environmental disasters. Would black soot in the smoke from the fires circle the globe and block out the sun？

Many said "no way"; rain would wash the black soot from the atmosphere. However in America, air-sampling balloons have detected high concentrations of particles similar to those collected in Kuwait.

Now that the fires are out, scientists are turning their attention to yet another threat: the oil that didn't catch fire. It has formed huge lakes in the Kuwaiti desert. They trap insects and birds, and poison a variety of other desert animals and plants.

The only good news is that the oil lakes have out affected the underground water resources. So far, the oil has not been absorbed because of the hard sand just below the surface.

Nothing, however, stops the oil from evaporating. The resulting poisonous gases are choking nearby residents.

Officials are trying to .organize a quick cleanup, but they're not sure how to do it. One possibility is to burn the oil. Get those black soot detectors ready.

(31)

A．The threat of poisonous desert animals and plants.

B．The exhaustion of energy resources.

C．The destruction of oil wells.

D．The spread of the black soot from the fires.

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第8题

听力原文：Are you afraid, to raise your hand in class, even when you know the answer？ If yo

听力原文： Are you afraid, to raise your hand in class, even when you know the answer？ If you are, most people would say that you are shy. If you feel shy, you are not alone. Nine out of ten people are at least a little shy. But however shy you are, scientific evidence seems to show that it isn't your fault. You may have been born that way.

How do psychologists measure shyness？ One way is by observation. They keep detailed records of people's actions—like how often these people speak to others, or how long it takes someone to say "Hello" to a stranger. Another way to measure shyness is to ask people questions. The test only takes about 10 minutes. It asks question like "Do you like going out a lot？" and "Do you have many friends？" People must answer either "Yes" or "No". These questions can predict how people actually behave in social situations. Suppose the test tells you that someone is shy. Chances are good that person will act shy.

When scientists measure shyness, they are really comparing degrees of shyness. In other words, when researchers say people are shy, they really mean they are more shy than others.

(30)

A．Because many people don't know how to behave in social situations.

B．Because most people are shy by nature.

C．Nobody will laugh at you for being shy.

D．Shyness is difficult to overcome.

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第9题

听力原文：Are you afraid to raise your hand in class, even when you know the answer？ If you

听力原文： Are you afraid to raise your hand in class, even when you know the answer？ If you are, most people would say that you're shy.

If you feel shy, you're not alone. Nine out of ten people are at least a little shy. But however shy you are, evidence seems to show that it isn't your fault. You may have been born that way.

How do psychologists measure shyness？ One way is by observation. They keep detailed records of people's actions—like how often these people speak to others, or how long it takes someone to say hello to a stranger.

Another way to measure shyness is to ask people questions. The test only takes about 10 minutes. It asks questions like "Do you like going out a lot？" and "Do you have many friends？" people must answer either yes or no. These questions can predict how people actually behave in social situations.

Suppose the test tells you that someone is sky. Chances are good that that person will act shy.

When Scientists measure shyness ,they're ally comparing degrees of shyness. In other words, when researchers say people are shy, they really mean they are more shy than others.

(29)

A．Because many people don't know how to behave in social situations.

B．Because most people are shy by nature.

C．Nobody will laugh at you for being shy.

D．Shyness is difficult to overcome.

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