2. 外语
  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 recove

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

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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 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. Although your mind slows down, from time to time you will dream. Scientists 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 deeply. Other people believe that drinking warm milk will help make you drowsy.
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 described here
答案D
解析 文章并没有提及成人需要多少睡眠时间。因此选D。
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