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

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