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  3. Few scientific fields are as full of risk as that of research into human intelligence. The two questions that【1】over and over a

Few scientific fields are as full of risk as that of research into human intelligence. The two questions that【1】over and over a

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问题     Few scientific fields are as full of risk as that of research into human intelligence.  The two questions that【1】over and over again are "is it a result of nature or nurture?" and "does race make a difference?"
    Making【2】comments about the second question can be a【3】move, as James Watson, a co-discoverer of DNA structure, recently found. He suggested that he was "【4】about the prospect of Africa"【5】"all our social policies are based on the fact that their intelligence is the same as ours (white people) 【6】all the testing says not really". Such【7】are not merely【8】, they are scientifically weird. If the term race has any useful scientific meaning, then Africa, the continent where modern【9】began, is most racially diverse. The resulting【10】forced Dr Watson to leave his laboratory.
    【11】, the study of【12】between intelligence and genetics has some wiser practitioners. One of them, Terrie Moffitt, of King’s College, has just【13】a project【14】the relative importance of nature and nurture. Dr Moffitt’s team【15】the effect on intelligence of breastfeeding, but in a genetic context. Previous studies have shown that breastfed children are more intelligent,【16】about six IQ points, than those given baby formulas.
    The team, however,【17】the involvement of a gene called FADS2, which comes in two varieties, known as C and G. The researchers【18】if these two varieties【19】differently with breast milk.【20】on data two groups of people, they found that the intelligence increase associated with breastfeeding only happened to people having inherited at least one copy of the C variety. The effect did not depend on the social classes or IQs of the parents.
选项 A、happen
B、rise
C、arise
D、arouse
答案C
解析 本题考查可以和主语搭配的谓语动词。比较四个选项，happen常用于偶然发生的事件，所以和主语questions搭配不符合表达习惯；rise常用于数量或水平的增加、提高，所以也不能和questions连用；arise意为产生，出现时尤指问题或困境的产生或发生，所以可以和原文的questions连用，意为：这两个问题反复出现；arouse常用来表示引起，激起(感情，态度)，而原文中空格后不带宾语，需填入的是一个不及物动词，因此arouse也不符合题意，由此可知C选项为正确答案。
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