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  3. After a day of work and play, the body needs to rest. Enough sleep is necessary for good health. During this time, the body reco

After a day of work and play, the body needs to rest. Enough sleep is necessary for good health. During this time, the body reco

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问题    After a day of work and play, the body needs to rest. Enough sleep is necessary for good health. During this time, the body recovers from the activities of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day.
   There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to another.
   Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly (Although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
   If you have trouble falling asleep, some people recommend that you breathe very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will help you fall asleep!
This passage suggests that not getting enough sleep might cause you to______.
选项 A、dream much often
B、have poor health
C、feel too nervous
D、breathe very deeply
答案B
解析 根据第一段第二句“Enough sleep is necessary for good health．”可知，充足的睡眠对健康很有必要。由此可推知，不充足的睡眠可能会导致健康情况很糟糕。故选B。A、C两项内容文章并未提及，D项是有助于睡眠的方法。
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