聽力原文：Researchers have found that daily walking may improve sleep quality. They have also noticed that only those who exercise in the morning have the beneficial effects on sleep. Those who exercised in the evening actually had more trouble falling asleep. One possible explanation is that morning versus evening exercise may affect sleep quality. Morning exercise may get the body clock in good order, and evening exercise may upset it. However, more research is needed to confirm this theory.

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聽力原文： Researchers have found that "cool" colors, such as blues and greens, can make us feel calm and relaxed. Blue and green surroundings can also lower blood pressure, pulse rate, and breathing rate. "Warm" colors, such as reds, yellows, and oranges, affect us differently than "cool" colors do. "Warm" colors can actually make us feel warmer and excited. They stimulate heartbeat, raise blood pressure, and quicken breathing.

Yellow, a bright, sunny color, often makes people feel happy and more active. Yet it makes some people feel hot and restless. Red often makes people feel energetic. But not everyone feels good wearing red.

If some colors can make us feel better, might certain colors also help us think better? According to a 3year study in Germany, the answer seems to be yes. Scientists studied how various colors affect school children. And they found that certain colors could raise I. Q. as much as 12 points. In the experiment, rooms with low ceilings were painted in different colors. The more popular colors were light blue, yellow, yellow-green, and orange. Less popular colors such as white, black, and brown caused a drop in I. Q. The study found that the color orange in particular improved social behavior, cheered up children's spirits and made them feel less hostile and irritable.

Do people's color preferences tell us anything about their personalities? Some researchers think they do. According to these researchers, people who are more out-going usually prefer "warm" colors. People who are quieter, less people-oriented, often prefer "cool" colors.

If you live in a room painted light blue, you may feel________.

A．happy and energetic

B．warm and excited

C．calm and relaxed

D．hot and restless

聽力原文：M: American researchers have made a discovery that might help them better understand the mysterious sense of smell, VOA's Jessica Bermon reports.

W: There are about a thousand protein receptors in the nose that tell the brain what it's smelling. Each receptor can detect one or more odors but scientists have never before linked a specific odor molecule to a particular receptor. Writing in the journal Science, researchers at New York's Columbia University report doing just that with a meat odor and a receptor in the noses of rats. Steward Fairstine led the team of investigators. He says humans arc capable of discerning something like ten thousand different odors. Mrs. Fairstine says the research might also tell scientists more about brain chemicals and hormones which are part of the same family as odor receptors. Jessica Bermon, VOA news, Washington.

The research was done by scientists at ______.

A．New York University

B．Columbia University in New York

C．Washington University

D．Harvard University

聽力原文： American researchers have reported progress in learning how the ancient traditional Chinese method of acupuncture fights pain and other conditions. During acupuncture, very small, sharp needles are placed in the skin at targeted points on the body. Bruce Rosen presented an acupuncture study at a meeting of the American Psychosomatic Society in Orlando, Florida. Doctor Rosen is with the Harvard Medical School in Boston, Massachusetts.

Doctor Rosen reported that the study findings could show how the brain might help people suffering from a number of health problems. These include pain, unexplained worry and sadness and some disorders of the stomach and intestines. The findings also may aid people who are fighting dependence on substances like illegal drugs.

Doctor Rosen led a team that studied about twenty healthy people. The team examined the people with functional magnetic resonance imaging devices. MRI's can show changes in the flow of blood and the amount of oxygen in the blood. They studied the people before, during and after acupuncture. The researchers placed acupuncture needles in the skin on the people's hands. They chose places linked to pain relief in traditional Chinese acupuncture.

Meat of the people reported that their hands felt heavy after the needles were placed. Blood flow to some areas of the brain decreased quickly in these people. Doctor Rosen said that was a sign that the acupuncture was working correctly.

But a few of the people said their hands hurt. Their needles were probably not placed correctly. Their MRI's showed an increase in blood in the same areas of the brain where the other people showed a decrease.

According to the findings by the American researchers, what is of help in relieving patients' pain and worry?

A．Brain.

B．Skin.

C．Medicine.

D．A sharp needle.

聽力原文：M: Did you know that astronauts have made commercial products in space?

W: No, I wasn't aware of that. What kind of products?

M: Tiny plastic beads with a little hole through it.

W: Tiny balls? Do you mean to tell me that astronauts have nothing better to do than make jewelry beads in space? It seems to me they could make more useful things out there.

M: Oh, but these little balls aren't for jewelry. They can be used for scientific purposes to conduct cancer research .

W: That sounds better, but why make such objects in space rather than on earth?

M: Because earth gravitational pull affects the beads. They produced on earth are distorted, not exactly tumid. The ones made in space are precisely round.

W: Sounds reasonable.

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A．Astronauts' clothing.

B．Products made in space.

C．Costume jewelry.

D．Problems in manufacturing.

聽力原文： A unique laboratory at the University of Chicago is busy only at night. It is a dream laboratory where researchers are at work studying dreamers. Their findings have revealed that everyone dreams from three to seven times a night, although in ordinary life a person may remember none or only one of his dreams. While the subjects, usually students, are asleep, special machines record their brain waves and eye movements as well as the body movements that signal the end of a dream. Surprisingly, all subjects sleep soundly. Observers report that once the dream has started, one's body relaxes and his eyes become more active, as if the curtain had gone up on a show. As soon as the machine indicates that the dream is over, a buzzer wakens the sleeper. He sits up, records his dream, and goes back to sleep, perhaps to dream some more. Researchers have found that if the dreamer is wakened immediately after his dream, he can keep the dream. If he is allowed to sleep even five more minutes, his memory of the dream will have faded.

What are the researchers at the University of Chicago studying?

A．Different kinds of dreams.

B．The content of dreams.

C．Dreamers while they dream.

聽力原文： Most animals have little connection with animals of a different kind, / unless they hunt them for food. / Sometimes, however, two kinds of animals come together in a partnership / which docs good to both of them. I You may have noticed some birds sitting on the backs of sheep. /This is not because they want a ride, / but because they find easy food in the parasites on sheep. / The sheep allow the birds to do so/ because they remove the cause of discomfort. / So although they can manage without each other, they do better together. / Sometimes an animal has a plant partner. / The relationship develops until the two partners cannot manage without each other. / This is so in the corals of the sea. / In their skins they have tiny plants which act as" dustman", / taking some of the waste products from the corals / and giving in return oxygen which the animal needs to breathe. / If the plants are killed, / or are even prevented from light so that they cannot live normally, / the corals will die.

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聽力原文：M: Well, you seemed to be having fun watching the movie?

W: Yeah, it was funny. I think it kept me in stitches right from the start.

M: You know, whenever I watch a comedy, I always like to know why it is that people like to laugh. I mean, why does it feel so good to laugh?

W: Yeah, I heard from my biology professor that even after centuries of scientific research, no one knows why human beings and just a few other primates laugh.

M: I read that Charles Darwin thought that laughter begins with small babies. He believed that even prehistoric parents must have interpreted baby’s laughter. The parents enjoyed the laughter, which encouraged them to continue caring for the child.

W: Yes, apparently researchers have also found that it has a positive effect on many parents and that it produces certain hormones that actually switch on the body’s immune system and actually help fight off diseases. So it could be helpful to fight off diseases.

M: I also heard that some psychology professors found that men are more likely to make jokes than women are, and women are more likely to laugh at them than men are. 30

W: If only your jokes are funny, I might laugh more and fit the pattern.

M: Well, I’ve heard that apes also like laughing.

W: I heard that too. Chimpanzees, apes, and a few other primates laugh, but no other animals do. I’ve seen them laugh at zoos, when tickling each other, and when playing chasing games. Their laugh sounds like rapid panting, but I’ve been assured it’s a kind of laughing.

M: Which reminds me I’d better get back to those apes I have for roommates before they eat all the chicken I left out in the kitchen!

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A．The purpose of laughter.

B．The cause of laughter and its effects.

C．Why and when people laugh.

D．The origin of laughter.

聽力原文： Colors have always been used to describe not only our feelings, but also our physical health and attitudes. "Red with rage" describes anger; "in the pink" means to be in good health; "feeling blue" is a sad way to feel; and "green with envy" indicates a jealous attitude. According to colorgenics experts, colors not only are mirror of ourselves, but they have an effect on us as well. Blue is calming, while red is stimulating and exciting. Yellow is a happy color that makes us feel good about life. Pink awaken love and kindness.

Colors have always been used to describe not only our【11】, but also our physical health and attitudes. "Red with rage" describes【12】; "in the pink" means to be in good health; "feeling blue" is a sad way to feel; and "green with envy" indicates a jealous attitude.【13】to colorgenics experts, colors not only are mirrors of ourselves, but they have an【14】on us as well. Blue is calming, while red is stimulating and【15】. Yellow is a happy color that makes us feel good about life. Pink awaken love and kindness.

聽力原文： Scientists say sharks have lived in the world's oceans for millions of years. Scientists say there are more than three- hundred-fifty different kinds of sharks.

(14[B]) Sharks do not have bones, and a shark has an extremely good sense of smell. It can find small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their food. Some sharks will eat just about anything. Many unusual things have been found in the stomachs of some large sharks. They include shoes, dogs, a cow's foot and metal protective clothing.

About forty percent of the different kinds of sharks lay eggs. The others give birth to live young. (15[C]) Some sharks carry their young inside their bodies like humans do.

Scientists are beginning to understand the importance of sharks to humans. (16[B]) Medical researchers want to learn more about the shark's body defense system against disease. They know that sharks recover quickly from injuries. Sharks appear never to suffer infections, cancer or heart diseases.

What is this passage mainly about?

A．Call On people to protect sharks.

B．Point out the living environment of sharks.

C．Explain why the sharks are dangerous.

D．An introduction to sharks.