题目内容：
请根据短文内容，回答题。Taking a Nap during the Day
Medical experts say most Americans do not get enough sleep. They say more Americans need to __________ (51) for a short period in the middle of the day. They are advising people to sleep lightly __________ (52) continuing with other activities.
One study earlier this year found that persons who sleep for a few minutes during the day were less likely to die of __________ (53) disease. The study followed more than 2,300 Greekadults __________ (54) about six years. Adults who rested for half an hour at least three times a week had a 37 percent lower __________ (55) of dying from heart disease than those who did not nap.
Study organizers said the strongest __________ (56) was in working men. They said naps might improve health by mitigating ( 减低 ) tension __________ (57) by work.
Some European and Latin American businesses have supported the idea of __________ (58) for many years. They urge (催促) people to __________ (59) work, go home and have a nap before returning. In the United States, some companies let workers rest briefly in their offices. They believe this reduces mistakes and accidents, and also __________ (60) the amount of work a person can do.
Sleep experts say it is likely that people __________ (61) more mistakes at work than at other times. They say people should not carry out important duties __________ (62) they feel sleepy. And they say the best thing to do is to take a nap.
About twenty minutes of rest is all you __________ (63). Experts say this provides extra energy and can increase your __________ (64) until the end of the day. But experts __________ (65)that a nap should last no more than twenty to thirty minutes. A longer nap will put the body into deep sleep and waking up will be difficult.
_________ A．work
B．wait
C．rest
D．live
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