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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
99
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.
【C4】
选项
A、apparent
B、certain
C、definite
D、obvious
答案
B
解析
本题要求填入一个能与介词for搭配的形容词。四个选项中,只有B项certain(肯定)可以与for构成固定短语,for certain意思是"肯定地,确凿地"。A项ap—parent(明显的)、C项definite(明确的)和D项obvious(明显的),均不能与for搭配。
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