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  3. During recent years we have heard much about "race" ; how this race does certain things and that race believes certain things an

During recent years we have heard much about "race" ; how this race does certain things and that race believes certain things an

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问题     During recent years we have heard much about "race" ; how this race does certain things and that race believes certain things and so on. Yet, the【C1】______phenomenon of race consists of a few surface indications.
    We judge race usually【C2】______the colouring of the skin: a white race, a brown race, a yellow race and a black race. But【C3】______you were to remove the skin you could not【C4】______anything about the race to which the individual belonged. There is【C5】______physical structure, the brain or the internal organs to【C6】______a difference.
    There are four types of blood.【C7】______types are found in every race, and no type is distinct to an race. Human brains are the【C8】______. No scientists could examine a brain and tell you the race to which the individual belonged. Brains will【C9】______in size, but this occurs within every race.【C10】______does size have anything to do with intelligence. The largest brain【C11】______examined belonged to a person of weak【C12】______. On the other hand, some of our most distinguished people have had【C13】______brains.
    Mental tests which are reasonably【C14】______show no differences in intelligence between races. High and low test results both can be recorded by different members of any race.【C15】______equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.
    Individuals of every race【C16】______civilization to go backward or forward. Training and education can change the response of a group of people,【C17】______enable them to behave in a【C18】______way.
    The behavior and ideals of people change according to circumstances, but they can always go back or go on to something new【C19】______is better and higher than anything【C20】______the past.
【C3】
选项 A、if
B、since
C、as
D、while
答案A
解析 从结构上看，此句为虚拟语气，所以我们选用if为其引导词，故A项正确。
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考研英语一

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