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Do you know why you sleep? You may think it's because you're tired. Or perhaps you've been told sleep
is good for you. Yet no one knows exactly why or how people sleep.
Until the early 1950s, most scientists thought the body and brain rested during sleep. Then a scientist
watched people sleep. He noticed that during periods of between 5 and 30 minutes, sleepers' eyes made
rapid movements, as if they were watching something. He called these periods REM (Rapid Eye Movement)
sleep. He called periods when sleeper's eyes did not move non-REM sleep.
Whenever the scientist woke people during REM sleep, they were having vivid dreams. Measurements
showed that sleepers' pulses (脉搏) went up quickly during REM sleep. Their breathing, heartbeat, and the
blood going to the brain also increased. Far from being a time of rest, sleep is a time when the body is hard
at work. Scientists still don't know the reason for this. Some believe REM sleep makes learning easier.
Babies spend a lot of time on REM sleep. Because of this, some scientists believe that REM sleep helps
the brain grow. Others think REM sleep is a time for the brain to empty the day's garbage.
One thing all the scientists agree on is that sleep is necessary. Without enough sleep, people make
mistakes. Most car accidents happen during the early morning hours, when people are sleepiest.
B. sleep
C. increase
D. stay the same
B. large
C. empty
D. clear anti lively
B. Paragraph 2
C. Paragraph 3
D. Paragraph 4
B. about the scientific research of REM sleep
C. about how to empty the day's garbage
D. that our body is good at work when sleeping
B. young people can experience REM sleep
C. the speed of sleepers' pulses will slow down during the REM sleep
D. all scientists have the same opinion on REM sleep
在下面对话的空白处，填入适当的短语或句子，使对话意思完整、通顺。
(Rick is studying with Alex at his home．)
Rick：Hi，Alex! We’ve been studying for hours．Let’s relax for a moment．OK?
Alex：Sure．I feel a little tired and I want to have a rest too．
Rick：Why not listen to the music and 1．
Alex：Something to drink? Great! I’m really thirsty．
Rick：I’d like some juice．2．
Alex：I want some water．
Rick：OK．Here yon are．
Alex：Thanks．Er．．．Rick，would you mind turning down the music? I want to talk to yon．
Rick：Oh，I’ll turn it off．3．
Alex：I am very stressed out these days．I am afraid 4．
Rick：I don’t think you may fail your exam．You’re been studying very hard．
Alex：But ｍy reading is not very good．
Rick：It can’t be difficult．You just need to be more careful while reading．So don’t worry．
Alex：Thank you for encouraging me．
Rick：5．
查看习题详情和答案>>No one likes the mosquito. But the mosquito may decide that she loves you. She? Yes, she. It's true that
male mosquito doesn't bite and only the female mosquito bites because she needs blood to lay eggs. She is
always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn't
like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just
remember you are chosen. You're different from the others!
If the mosquito likes you, she lands on your body without letting you know. She bites you so quickly and
quietly that you may not feel anything different. After she bites, you will have an itch (痒) on your body
because she puts something from her mouth together with your blood. By the time the itching begins, she has
flown away.
And then what happens? Well, after her delicious dinner, the mosquito feels tired. She just wants to find a
place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs.
B. News Report.
C. Sports Square.
D. Culture Corner.
B. feel very tired soon
C. choose another one instead
D. find a different kind of food
B. too quickly to let you know
C. only if you're female
D. when she gets angry with you
B. Because she bites so quietly.
C. Because she lays eggs in your blood.
D. Because she puts something special into your blood.
We know the mosquito very well．Mosquitoes fly everywhere．They can be found almost all over the world , and there are more than 2,500 kinds of them．
No one likes the mosquito．But the mosquito may decide that she loves you, she? Yes, she．It’s true that male mosquito doesn’t bite and only the female mosquito bites because she needs blood to lay eggs．She is always looking for things or people she wants to bite．If she likes what she finds, she bites．But if she doesn’t like your blood ,she will turn to someone else for more delicious blood．Next time a mosquito bites you, just remember you are chosen．You’re different from the others!
If the mosquito likes you ,she lands on your body without letting you know．She bites you so quickly and quietly that you may not feel anything different．After she bites, you will have an itch （痒）on your body because she puts something from her mouth together with your blood．By the time the itching begins, she has flown away．
And then what happens? Well ,after her delicious dinner, the mosquito feels tired．She just went to find a place to have a good rest．There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs．
1．In which part of a magazine can you probably read this article?
A．Science World B．News Report C．Sports Square D．Culture Comer
2．When a mosquito decides that she doesn’t like your blood, she will ________．
A．land on your body B．feel very tired soon
C．choose another none instead D．find a different kind of food
3．The mosquito bites you _____．
A．in order to have a good rest B．too quickly to let you know
C．only if you’re female D．when she gets angry with you
4．Why do you have an itch after the mosquito bites you?
A．Because she drinks too much．
B．Because she bites so quietly．
C．Because she lays eggs in your blood．
D．Because she puts something special into your blood．
查看习题详情和答案>>