题目内容
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REM occurs at the third and fourth stage during which we experience the deepest sleep.
A．Y
B．N
C．NG
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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.
What's Happening While Sleeping？
Sleep is very important to humans. The average person spends 220,000 hours of a lifetime sleeping. Until about thirty years ago, no one knew much about sleep. Then doctors and scientists began doing research in sleep laboratories. They have learned a great deal by studying people as they sleep, but there is still much they don't understand.
Scientists study the body characteristics that change during sleep, such as body temperature, brain waves, blood pressure, breathing, and heartbeat. They also study rapid eye movement (REM). These scientists have learned that there is a kind of sleep with REM and another kind with no rapid eye movement (NREM).
NREM is divided into three stages. In stage one, when you start to go to sleep, you have a pleasant floating feeling. A sudden noise can wake you up. In stage two, you sleep more deeply, and a noise will probably not wake you. In stage three, which you reach in less than thirty minutes, the brain waves are less active and stretched out. Then, within another half hour, you reach REM sleep. This stage might last an hour and a half and is the time when you dream. For the rest of the night, REM and NREM alternate.
Body movement during sleep occurs just before the REM stage. The average person moves about thirty times during sleep each night.
Sleep is a biological need, but your brain never really sleeps. It is never actually blank. The things that were on your mind during the day are still there at night. They appear as dreams, which people have been discussing for centuries. At times people believed that dreams had magical powers or that they could tell the future.
Sometimes dreams are terrifying, but they are usually a collection of scattered, confused thoughts. If you dream about something that is worrying you, you may wake up exhausted, sweating, and with a rapid heartbeat. Dreams have positive effects on our lives. During a dream, the brain may concentrate on a problem and look for different solutions. Also, people who dream during a good night' s sleep are more likely to remember newly learned skills. In other words, you learn better if you dream.
Researchers say that normal people may have four or five REM periods of dreaming a night. The first one may begin only a half hour after falling asleep. Each period of dreaming is a little longer, the last one lasting up to an hour. Dreams also become more intense as the night continues. Nightmares usually occur toward dawn.
People dream in color, but many don' t remember the colors. Certain people can control some of their dreams. They make sure they have a happy ending. Some people get relief from bad dreams by writing them down and then changing the negative stories or thoughts into positive ones on the written paper. Then they study the paper before they go to sleep again.
Many people talk in their sleep, but it is usually just confusing half sentences. They might feel embarrassed when someone tells them they were talking in their sleep, but they probably didn't tell any secrets.
Sleepwalking is most common among children. They usually grow out of it by the time they become adolescents. Children don' t remember that they were walking in their sleep, and they don' t usually wake up if the parent leads them back to bed.
Some people have the habit of grinding their teeth while they sleep. They wake up with a sore jaw or a headache, and they can also damage their teeth. Researchers don' t know why people talk, walk, or grind their teeth while they are asleep.
There are lots of jokes about snoring, but it isn' t really funny. People snore because they have trouble breathing while asleep. Some snorers have a condition called sleep apnea (呼吸暂停). They stop
A．Y
B．N
C．NG
A.REM睡眠潜伏期延长
B.REM睡眠潜伏期缩短
C.REM睡眠片段化
D.REM睡眠连续化
Diffusion of light in the sky occurs owing to ______.
A．atmospheric impurities
B．molecules of gas
C．varied shades of colour
D．different times of the day
According to the passage, which of the following is NOT a characteristic of REM sleep？
A．The eyes dart around.
B．It lasts 8 to 15 minutes.
C．The delta rhythm is present.
D．The sleeper dreams.
