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

　　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.
【C13】
选项 A、affirm
B、witness
C、observe
D、approve
答案A
解析 语义衔接/词义辨析题。本题目选择动词，在非限制性定语从句中充当谓语。选项A．affirm证实，确定；B．witness目击，证明；C．observe观察；遵守；D．approve赞成，批准。选项B常用作及物动词；选项C和选项D一般以人作主语。因此，正确答案为A。
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