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The amount of sleep a human being needs depends on【C1】______ , the individual and possibly race. For example, doctors think that
The amount of sleep a human being needs depends on【C1】______ , the individual and possibly race. For example, doctors think that
admin
2014-09-24
40
问题
The amount of sleep a human being needs depends on【C1】______ , the individual and possibly race. For example, doctors think that pre-school children need between 10 and 12 hours a night; school children between 9 and 11 hours; and adults between 7 and 9 hours. There are exceptional【C2】______ of old people who only sleep between 2 and 3 hours a day and continue to be active and healthy. The sleep requirements of different【C3】______ also appear to be different. Japanese people, for example, sleep fewer hours than Europeans.
It is not known for【C4】______ if mental activity(apart from dreaming)occurs when a person is asleep.【C5】______ , it is certainly true that some people can wake up at a specific, predetermined time. There are also【C6】______ about mathematicians who solve difficult problems during sleep, because their【C7】______ minds continue working on the problem.
Some types of unpleasant dreams(or "nightmares")are quite【C8】______ ; the dreamer is taking a test, but is not properly prepared; he is falling from a tree;【C9】______ an animal or thing is chasing him. Some people say these last two occur【C10】______ man’s ancestors lived in trees and were in constant danger from wild animals.
【C1】
选项
A、gender
B、occupation
C、age
D、personality
答案
C
解析
本题要求根据上下文选择词义。本句为第一段的主题句。从主题句后的例子可以看出,不同的年龄段的人需要的睡眠量不同。因此,C项age(年龄)符合上下文句意的要求,是正确答案。A项gender(性别)、B项occupation(职业)和D项personality(个性)与下文毫无关系,所以都不正确。
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