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.
【B10】

选项 A、normal
B、common
C、mean
D、total

答案C

解析 考查形容词辨析。此处意思显然为“比平均分100分多12分到15分”。一般来说,average最常用的意思是“平均的”,mean表达这个意义时比较正式,符合语义。normal“正常的”,common“普通的,共同的”,total“总共的”,均不符合题意。故选C.mean。
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