题目

缺词填充Have you heard such an old English saying? It says that we must go to b__1___ early and get up early. Then we should be h__2__ and clever.This is t__3____ .The body must have enough sleep to be healthy .Children of teenagers(青少年) should have ten hours’ s___4_____ every night .If they don’t have e__5____ sleep, they can’t do their work very w__6____.The body also needs e__7___. Walking, running, jumping, swimming and playing games are all exercise. Exercise keeps the body s___8__. Exercise also keeps the blood(血) moving around inside the body .It is very i__9__ because6.Would you mind _____ here?__  I'm sorry about that.(  )A.no smokingB.not smokingC.no smoke
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