You need a Nap
Medical experts say most Americans do not get __1__ sleep. They say more Americans need to rest for a short period in the middle of the day. They are advising people to sleep lightly before __2__ with other activities.
One study earlier this year found that persons who sleep for a few minutes during the day were less __3__ to die of disease. The study followed more than 2,300 Greek adults __4__ about six years. Adult who rested for half an hour __5__ 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 __6__ evidence was in working men. They said naps might improve health by mitigating tension caused by work.
Some European and Latin American businesses have supported the __7__ of napping for many years. They urge people to __8__ 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 in their offices. They believe this reduces __9__ and accidents, and also __10__ 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 __11__ important duties when they feel sleepy. And they say the best thing to do is to take a nap. About twenty minutes of rest is __12__ you need. Experts say this provides extra energy and can increase your effectiveness __13__ the end of the day. But experts warn that a nap __14__ last no more than twenty to thirty minutes. A longer nap will put the body into deep sleep2 and waking up3 will be __15__.
1 A sweet B sound C sufficient D less
2 A checking B sharing C continuing D meeting
3 A lovely B likely C fondly D finely
4 A for B at C in D with
5 A at least B at most C at last D at first
6 A strongest B biggest C clearest D powerless
7 A experiment B reform C idea D way
8 A change B improve C repeat D leave
9 A work B mistakes C energy D time
10 A increase B decrease C improve D low
11 A about B out C off D away
12 A all B few C any D nothing
13 A unless B while C until D during
14 A may B would C should D might
15 A helpful B easy C difficult D happy
参考答案：
1. C 2. C 3. B 4. A 5. A
6. A 7. C 8. D 9. B 10. A
11. B 12. A 13. C 14. C 15. C