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第6部分：完形填空（第51～55题，每题1分，共15分）
下面的短文有15处空白，请根据短文内容为每处空白确定一个最佳选项。
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 Greek adults （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.
51 A work B wait C live D rest
52 A between B before C besides D during
53 A heart B brain C mind D liver
54 A on B at C for D with
55 A risk B end C order D part
56 A view B argument C protest D evidence
57 A reduced B broken C caused D sensed
58 A napping B walking C working D learning
59 A repeat B improve C change D leave
60 A increases B corrects C repeats D realizes
61 A take B make C do D bring
62 A because B when C although D since
63 A forget B hope C need D admire
64 A position B pressure C demand D effectiveness
65 A warn B see C doubt D promise