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Look!This is a picture of our class．There are twenty-six boys and thirty girls 　　1　　 our class．　　2　　 of the girls is English．　　3　　 name is Helen．She is thirteen．She is a good student．Two of the boys 　　4　　 American．They 　　5　　 Tom and Bob．They are 　　6　　．There are two maps 　　7　　 the back wall．One is 　　8　　, the other 　　9　　 a map of the world．There 　　10　　 a big blackboard and two pictures on the front wall．

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阅读下面短文，掌握其大意，然后从A、B、C、D四个选项中选出最佳选项．

Taking a Nap(打盹)During the Day

　　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 heart disease．The study followed more than 2,300 Greek adults 　　4　　 about six years．Adults 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．

　　The study organizers said the strongest evidence was in working men．They said naps might improve 　　6　　 by mitigating(减低)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 　　9　　 and accidents, and 　　10　　 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 　　11　　．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 sleep and waking up will be 　　15　　．

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