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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
29
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.
【C6】
选项
A、stories
B、evidences
C、fictions
D、rumors
答案
A
解析
本句意为:"也有关于睡眠时解决数学题的科学家的……"从句意看,A项stories(故事)是最合适的选项。B项evidences(证据,证明)显然没有选择的依据,C项fictions指"小说,虚构",显然也不符合实际情况,而D项rumors(谣言,谣传)与句意差得更远。
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