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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 name.

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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