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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
19
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.
【C5】
选项
A、should
B、need
C、must
D、needn’t
答案
D
解析
下句讲“两个心理学家发现,每晚正常睡少于六小时的人比睡眠时间长的人更快乐、更积极”。因此可推断此处指“那些担心自己睡眠时间少于八小时的人是不需要担心的”,故选D。
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