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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【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.
【C6】
选项 A、thought
B、sight
C、cost
D、risk
答案A
解析 考查名词辨析。根据上一题的分析，空格处所在的句意为“______即将要做的事，他也会有点战战兢兢”，因此at the thought of“一想到…”符合题意。at the sight of“一看到…”，at the cost of“以…为代价”，at the risk of“冒…的风险”，均不符合语境。因此选A．thought。
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