Taking a Nap During the Day

　　Medical experts say most Americans do not get 51 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 52 with other activities.

　　One study earlier this year found that persons who sleep for a few minutes during the day were less 53 to die of heart disease. The study followed more than 2，300 Greek adults 54 about six years. Adults who rested for half an hour 55 three times a week had a 37 present 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 56 by mitigating tension caused by work.

　　Some European and Latin American businesses have supported the 57 of napping for many years. They urge people to 58 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 59 and accidents， and 60 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 61 And they say the best thing to do is to take a nap. About twenty minutes of rest is 62 you need. Experts say this provides extra energy and can increase your effectiveness 63 the end of the day. But experts warn that a nap 64 last no more than twenty to thirty minutes. A longer nap will put the body into deep sleep and waking up will be 65 .

　　1. A. sweet

　　B. sound

　　C. bad

　　D. enough

　　正確的答案是：D

　　2. A. checking

　　B. sharing

　　C. continuing

　　D. meeting

　　正確的答案是：B

　　3. A. lovely

　　B. likely

　　C. fondly

　　D. finely

　　正確的答案是：B

　　4. A. for

　　B. at

　　C. in

　　D. with

　　正確的答案是：A

　　5. A. at least

　　B. at most

　　C. at last

　　D. at first

　　正確的答案是：A

　　6. A. ability

　　B. health

　　C. thinking

　　D. life

　　正確的答案是：B

　　7. A. experiment

　　B. reform

　　C. idea

　　D. way

　　正確的答案是：C

　　8. A. repeat

　　B. improve

　　C. change

　　D. leave

　　正確的答案是：D

　　9. A. work

　　B. mistakes

　　C. energy

　　D. time

　　正確的答案是：B

　　10. A. never

　　B. seldom

　　C. too

　　D. also

　　正確的答案是：D

　　11. A. ready

　　B. good

　　C. sleepy

　　D. awake

　　正確的答案是：C

　　12. A. all

　　B. few

　　C. any

　　D. nothing

　　正確的答案是：A

　　13. A. unless

　　B. while

　　C. until

　　D. during

　　正確的答案是：C

　　14. A. would

　　B. may

　　C. might

　　D. should

　　正確的答案是：D

　　15. A. helpful

　　B. difficult

　　C. easy

　　D. happy

　　正確的答案是：B