40. The text is mainly about_________.

　　A. a strange man

　　B. an unusual party

　　C. how roller skating began

　　D. how people enjoyed themselves in the 18th century

　　B

　　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 makes it possible for 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 body relaxes 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, you will dream from time to time. Scientists who study sleep point out that when you are dreaming, 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 suggest breathing very slowly and very deeply. Other people believe that drinking warm milk will make you drowsy. There is also an old suggestion that counting sheep will put you to sleep.

　　41. The text makes us know that not getting enough sleep might make you _________.

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