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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
admin
2019-04-22
50
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.
【C2】
选项
A、dropped
B、out
C、fallen
D、taken down
答案
C
解析
句意:到十岁时,睡眠时间减少到9~10个小时,并且在青春期继续减少。drop和fall都有“下降,下跌”之意,其中drop意为“突然、迅速下降”,fall意为“慢慢下降”。结合语境选C。
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