单选题 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 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!

单选题 A good title for this passage may be ______.
A. Sleep B. Good Health
C. Dreams D. Work and Rest
【正确答案】 A
【答案解析】主旨题。通读短文可知，短文第一段指出睡眠能使人身体健康，第二、第三段则说明了睡眠的几种状态，而最后一段则介绍了让人入睡的几种方法。整篇短文都是围绕着“睡眠”这一主题，且短文中出现频率最高的也是sleep一词，因此不难确定本题正确答案就是[A]。
单选题 The word "drowsy" in the last paragraph means ______.
A. sick B. stand up
C. asleep D. a little sleepy
【正确答案】 D
【答案解析】词义推测题。通读该词所在段落，我们得知该段是对睡眠有问题的人的一些建议。再由该词所在句中的help(有助于)一词，结合常识就不难推知drowsy应指“昏昏欲睡的，想睡的”，即答案是[D]。有些考生误选了[C]项，但asleep是个状态形容词，指的是“睡着的，熟睡的”，用在这里显然不合适。其余两项：sick指“有病的，想吐的”；stand up则是个动词短语，指“起立”，词性上即不合本题要求。
单选题 This passage suggests that not getting enough sleep might make you ______.
A. dream more often B. have poor health
C. nervous D. breathe quickly
【正确答案】 B
【答案解析】分析推理题。本题应根据短文第一段第二句话：Sleep is necessary for good health(睡眠对身体健康是很有必要的)这一句来进行推断。既然要保持身体健康必须有睡眠，那么反过来就可合理推知：睡眠不足会不利于健康，这也正是[B]项的意思。本题这种根据一句话来进行推断、并且推断过程简单的分析推理题不是很常见，也可将其归入细节题中。
单选题 During REM, ______.
A. your eyes move quickly B. you dream
C. you are restless D. both [Ａ] and [Ｂ]
【正确答案】 D
【答案解析】细节题。短文第三段重点介绍了REM这个睡眠过程。其中第二句话即指出：..when dreaming occurs your eyeballs begin to move more quickly(一个人做梦的时候眼球移动速度加快)，据此可知本题正确答案为[D]。误选的考生大多是漏掉了you dream这个选项。
单选题 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 here
【正确答案】 D
【答案解析】细节题。由题干中的两个重点词汇the average number of hours of sleep和adult回到原文进行对照可以发现，短文并没有谈及成年人的平均睡眠时间这一问题，因此本题答案无疑就是[D]。