2. 公务员
  3. Most newborn babies sleep 17 to 18 hours【C1】______day. By age 10, this has【C2】______to 9 to 10 hours, and it continues to reduce

Most newborn babies sleep 17 to 18 hours【C1】______day. By age 10, this has【C2】______to 9 to 10 hours, and it continues to reduce

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问题    Most newborn babies sleep 17 to 18 hours【C1】______day. By age 10, this has【C2】______to 9 to 10 hours, and it continues to reduce during adolescence. Two-thirds of adults sleep seven to eight hours and one-tenth sleep more than nine. During old【C3】______, sleep decreases to an average of 6. 5 hours a night. For the average adult, then, seven or eight hours a night is "normal". But is it【C4】______?
   Some good sleepers worry that they regularly fall short of the Big Eight. They 【C5】______. Two psychologists at a well-known institute have found that【C6】______who naturally sleep less than six hours a night are happier and more active than longer sleepers. They may have more【C7】______and more sociable.
   Some people fear insomnia and it effects so strongly that their fears【C8】______their sleeplessness. But what’s the real effect of a few【C9】______hours? Several studies have shown that one rotten night with as little as two hours of sleep doesn’t【C10】______affect people’s performance the next day.
【C8】
选项 A、add to
B、keep back
C、result from
D、bring back
答案A
解析
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