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You are tired. ______ a rest?
A、Why stop to have B、Why not stop to have
C、Why not stop having
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2. ____ (recycle) books and paper is a good way (protect) the environment.
3. I don't____(agree) with you.I think zoos are terrible places for animals.
4. He is against (put) animals in cages.
5. People should stop____(ride)in cars and start (ride)bikes to help save the planet.
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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
comes from his office, he's always tired and wants to go to bed early.But his wife often has a lot of interesting
things to tell him after supper.She doesn't stop talking until she falls asleep,but it's usually too late and Mr.
Smith has to get up in time in the morning when she is asleep.
One day the man felt tirreble and couldn't go to work.He decided to go to see a doctor.And Mrs Smith went
to the hospital with him. Before her husband said what was the matter with him,the woman had told the doctor
all and the man understood why.He wrote out a prescription (处方). And when Mr. Smith brought the medicine
to the resulting room,the doctor said to her,"The bottle of medicine is for your husband and the pills are for
you.
"For me?" the woman said in surprise,"I'm fine.I don't need anything medicine!" "I don't think so,madam,"
said the doctor."They are sleeping pills.Your husband will soon be all right if you take them."
B. too busy not to have have a good rest.
C. busy enough to have a good rest.
D. not busy enough to have a good rest.
B. she doesn't stop talking after she falls asleep.
C. She keeps talking until she falls asleep.
D. She likes talking as she falls asleep.
B. Because he has to go to work.
C. Because he doesn't want to sleep.
D. Because his wife ask him to get up.
B. Because his wife didn't let hin go.
C. Because he fell ill.
D. Because he was too tired to go to work.
soon be all right if ______.
B. Mr. Smith takes the pills.
B. Mr. Smith takes the bottle of medicine.
D. Mrs Smith stops talking too much at night.