The idea that some groups of people may be more intelligent than others is one of those hypotheses that dare not speak its name.

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问题     The idea that some groups of people may be more intelligent than others is one of those hypotheses that dare not speak its name. But Gregory Cochran is【C1】______to say it anyway. He is that【C2】______bird, a scientist who works independently【C3】______any institution. He helped popularize the idea that some diseases not【C4】______thought to have a bacterial cause were actually infections, which aroused much controversy when it was first suggested.
    【C5】______he, however, might tremble at the【C6】______of what he is about to do. Together with another two scientists, he is publishing a paper which not only【C7】______that one group of humanity is more intelligent than the others, but explains the process that has brought this about. The group in【C8】______are a particular people originated from central Europe. The process is natural selection.
    This group generally do well in IQ test,【C9】______12-15 points above the【C10】______value of 100, and have contributed【C11】______to the intellectual and cultural life of the West, as the【C12】______of their elites, including several world-renowned scientists,【C13】______. They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts,【C14】______, have previously been thought unrelated. The former has been【C15】______to social effects, such as a strong tradition of【C16】______education. The latter was seen as a(n)【C17】______of genetic isolation. Dr. Cochran suggests that the intelligence and diseases are intimately【C18】______. His argument is that the unusual history of these people has【C19】______them to unique evolutionary pressures that have resulted in this【C20】______state of affairs.
【C15】

选项 A、given up
B、got over
C、carried on
D、put down

答案D

解析 考查动词短语辨析。本句意为“智商归因于社会影响”,且此处填入的动词短语需和下文的to搭配,只有D.put down(to)“归因于”符合语境。be given up to“让与…”,get over to“把…(向某人)说清楚,使理解”,均不符合题意。carry on“继续,进行”,不和to构成搭配。
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