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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、with
B、at
C、to
D、by
答案D
解析 本题考查可以和point(分数)搭配的介词而且要含有比较的意思，本句的大意是：母乳喂养的孩子比用配方婴儿奶粉喂养的孩子更聪明。因此空格处填入的介词也应表明在分值上的对比，比较四个选项，用介词with意为：母乳喂养的孩子伴随着6分的IQ；用介词at意为：得了6分的IQ；用介词to意为：达到6分的IQ；用介词by意为：高出了6分。由此可见只有by体现出了比较，因此D选项为正确答案。本句的意思是：在过去的研究中表明，母乳喂养的孩子更聪明，比用配方婴儿奶粉喂养的孩子IQ值高6分。在题目给出的四个介词中，通常表示程度或数量的变化用介词by，例如：House prices went up by 10%．(房价上涨了10%。)The party’s share of the vote fell by ten percentage points．(该党的得票率下跌了10个百分点。)
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