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

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

admin2012-09-11  52
问题     After a busy 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 the other.
    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 breathing very slowly and very deeply. Other people believed 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 quickly
B、you dream
C、you are restless
D、both A and B
答案D
解析 本题考查考生对细节的把握。答案在第三段第二、三句话：Scientists who study sleep state that when dreaming occurs，your eyeballs begin to move more quickly．“研究睡眠的科学家指出一个人做梦的时候眼球移动速度加快。”而第三句中“This stage of sleep is called REM”，this stage指代的是第二句中所表现出的状态。A项“做梦”以及B项“眼球快速转动”；而C项“你是得不到休息的”跟原文意思相反，因此正确答案为D。
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