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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、civilization
B、culture
C、society
D、humanity
答案D
解析 空格所在句子的大致意思和结构是：如果此类种族学说有任何科学意义的话(条件从句)，那非洲(这样一个现代______起源的大陆)(括号部分作Africa的同位语)，将会是人种最多样化的地方，如能准确把握此句的句意和结构，不难发现句中的关键信息是race，racially diverse，通过关键信息可推断出同位语部分所需填入的词和这些关键信息应保持一致，由此可知，只有D选项是正确答案，意为：……这样一个现代人类起源的大陆……
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