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【B1】______to say it anyway. He is that【B2】______bird, a scientist who works independently【B3】______any institution. He helped popularize the idea that some diseases not【B4】______thought to have a bacterial cause were actually infections, which aroused much controversy when it was first suggested.
    【B5】______he, however, might tremble at the【B6】______of what he is about to do. Together with another two scientists, he is publishing a paper which not only【B7】______that one group of humanity is more intelligent than the others, but explains the process that has brought this about. The group in【B8】______are a particular people originated from central Europe. The process is natural selection.
    This group generally do well in IQ test,【B9】______12-15 points above the【B10】______value of 100, and have contributed【B11】______to the intellectual and cultural life of the West, as the【B12】______of their elites, including several world-renowned scientists,【B13】______. They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts,【B14】______, have previously been thought unrelated. The former has been【B15】______to social effects, such as a strong tradition of【B16】______education. The latter was seen as a(n)【B17】______of genetic isolation. Dr. Cochran suggests that the intelligence and diseases are intimately【B18】______. His argument is that the unusual history of these people has【B19】______them to unique evolutionary pressures that have resulted in this【B20】______state of affairs.
【B13】

选项 A、affirm
B、witness
C、observe
D、approve

答案A

解析 考查动词辨析。结合上题,本句意为“正如他们中的精英,包括一些世界知名的科学家的事业所______的”,即精英人物用事业______了他们对西方做出的贡献,因此只有A.affirm“证实,确定,强化(信念等)”符合题意。witness“目击,证明”,一般用于witness sth.和as witnessed by sth.,不接that从句,用法上不符合要求:observe“观察,遵守”和approve“赞成,批准”一般用于人发出的动作,而从句的主语是the careers,故排除。
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