【单选题】
阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
Taking a Nap during theDay
Medical experts say mostAmericans do not get {{U}} (51) {{/U}} sleep. They say moreAmericans need to rest for a short period in the middle of the day. They are advising people to sleep lightly before {{U}} (52) {{/U}} with other activities.
One study earlier this year found that persons who sleep for a few minutes during the day were less {{U}} (53) {{/U}} to die of disease. The study followed more than 2,300 Greek adults {{U}} (54) {{/U}} about six years.Adult who rested for half an hour {{U}} (55) {{/U}} three times a week had a 37 percent lower risk of dying from heart disease than those who did not nap.
Study organizers said the strongest evidence was in working men. They said naps might improve {{U}} (56) {{/U}} by mitigating tension caused by work.
SomeEuropean and LatinAmerican businesses have supported the {{U}} (57) {{/U}} of napping for many years. They urge people to {{U}} (58) {{/U}} 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 {{U}} (59) {{/U}} and accidents, and {{U}} (60) {{/U}} increases the amount of work a person can do.
Sleep experts say it is likely that people make more mistakes at work than at other times. They say people should not carry out important duties when they feel {{U}} (61) {{/U}}.And they say the best thing to do is to take a nap.About twenty minutes of rest is {{U}} (62) {{/U}} you neeD、Experts say this provides extra energy and can increase your effectiveness {{U}} (63) {{/U}} the end of the day.But experts warn that a nap {{U}} (64) {{/U}} last no more than twenty to thirty minutes.A、longer nap will put the body into deep sleep and waking up will be {{U}} (65) {{/U}}.
B．few
C．any
D．nothing
网考网参考答案：A
网考网解析：
[解析] 本句的意思是：大约20分钟的打盹是你所需要的。所以，只有“About twenty minutes of rest is all you need”才说得通。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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