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  3. After a day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers fr

After a day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers fr

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问题     After a day of work and play, the body needs to rest. 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 quickly ( although your eye-lids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
    If you have trouble falling asleep, some people recommend breathing very slowly and very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep.
During REM, ______.
选项 A、your eyes move often
B、you dream
C、you are restless
D、both A and B
答案D
解析 细节推断题。文章说人在做梦时，眼球会开始快速地转动，这个阶段的睡眠叫REM。所以人处在REM状态时，会做梦，眼球也会经常转动。
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