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. (66)
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!
1.A good title for this passage is ______.
D.Work and Rest
2. The word “drowsy” in the last paragraph means_______ .
【参考答案】D[考点]词语理解题【精析】D 最终一段叙述的是有助于睡觉的办法。依据最终一段最终一句“…will help you fall asleep!”可推知，drowsy是fall asleep的近义词。sick：患病的，病态的;awake：醒着的;excited：振奋的;sleepy：疲倦的，昏昏欲睡的。依据句意“其他人以为喝热牛奶将有助于你疲倦”可知，选D。
3.This passage suggests that not getting enough sleep might cause you to_____ .
A.dream much often
B.have poor health
C.feel too nervous
D.breathe very deeply
【精析】B依据榜首段第二句“Enough sleep is necessary for good health.”可知，足够的睡觉对健康很有必要。由此可推知，睡觉不足可能会导致身体状况变糟糕。故选B。文章并未提及A、C两项，D项是有助于睡觉的办法。
4.According to the passage, during REM,_______ .
A.your eyeballs move quickly
C.you are restless
D.both A and B
【精析】D 依据第三段第二、三句“…when dreaming occurs, your eyeballs begin to move more quickly…This stage of sleep is called REM…”可知，当人们做梦时，眼球开端快速滚动，这个进程叫作REM。因而选项A、B都正确。故选D。
5.The average number of hours of sleep that an adult needs is ______.
A.approximately six hours
B.around ten hours
C.about eight hours
D.not stated in the passage