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問題詳情：

A strange thing happens to nearly everybody at night. They turn off the lights，pull up the covers and close their eyes. Six or seven sleeping hours later, they wake up again. Strange, isn't it?

Sleep puzzles science. Scientists and doctors would rather talk about why one can't fall asleep. They are not sure what causes sleep. The best conditions for sleep are good health and meal neither too big nor too small. No worries and a comfortable place are important, too. They advise against two in bed.

Strange things happen during sleep. For example，they move often. You would feel tired if you didn't. You also dream. Part of your brain is still awake when you dream. Dreaming happens when the memory and imagination in parts of your brain are still awake. Experiments have shown most of us dream in color. Bad dreams may be caused by stomachache. Don't worry if you dream. Some great stories and poems were begun while their writers slept.

38．Sleep puzzles scientists because they are not certain ________.

       A．why one can't fall asleep                 B．why one wakes up

       C．both A and B                          D．what causes sleep

39．The best conditions for sleep are ________.

       A．good health                            B．a meal neither too big nor too small

       C．no worries                                  D．good health，limited meal，no worries and a good place

40．You would feel tired during sleep if you ________.

       A．moved too often                                 B．slept on your back

       C．didn't move                                       D．went to sleep late

41．The best title for the passage is ________.

       A．How Can You Get a Good Sleep         B．The Strangeness of Sleep

       C．What Happens During Sleep           D．The Causes of Dream

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