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

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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 (an) 【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 词汇辨析/语义衔接题。本题目选择动词短语,在句子中充当谓语。选项A.be given up to让与……;B.get over克服(不与to连用);C.carry on继续(不与to连用);D.be put down to归因于。选项D.be put down to归因于,句意为“智商归因于社会影响”,符合句子含义。因此,正确答案为D。
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