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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!
The average number of hours of sleep that an adult needs is______ .
选项 A、approximately six hours
B、around ten hours
C、about eight hours
D、not stated in the passage
答案D
解析 第一段讲述了充足睡眠的好处，第二段概述了睡眠的四个等级，第三段讲述了做梦时眼睛的一些动作，最后一段给出了一些有助于睡日民的方法。但是文章并没有说明成年人所需要的睡眠时间的平均值。故选D。
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