四．词汇填空。（用单词的正确形式填空）（每题 1 分，共 10 分）

　　Do you sometimes feel a little    31    （疲劳的） in the early afternoon？ Many people also feel that after    32. They may think it‘s because we eat too much. Or， in summer，they may think it is too hot. However， the real reason is in their bodies.About eight hours after you    33    (醒来) up， your body temperature goes down.

　　In many parts of the world， people take naps(打盹) in the middle of the day. This is really true when it’s warmer， and the hot weather makes work    34    （困难的）in the early afternoon. Now researchers are saying that naps are good for everyone at any time. A nap is good for h    35. If people often take naps， there are often few    36    （问题） with their hearts.

　　But many working people have no time to take naps. Though doctors may ask them to take naps，    37    （然而）， bosses don‘t let them do it！ If you do have the c    38 （机会）， remember that the best time to take a nap is about eight hours after you get up. A short sleep too l 39    (迟的，晚的) in the day may only make you feel more tired and sleepy. This can also happen if you sleep for too long. If you do not have enough time， try a short nap --- even ten minutes of sleep can be    40    .（有帮助的）

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