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 (1) to say it anyway. He is that (2) bird, a scientist who works independently (3) any institution. He helped popularize the idea that some diseases not (4) thought to have a bacterial cause were actually infections, which aroused much controversy when it was first suggested.
(5) he, however, might tremble at the (6) of what he is about to do. Together with another two scientists, he is publishing a paper which not only (7) that one group of humanity is more intelligent than the others, but explains the process that has brought this about. The group in (8) are a particular people originated from central Europe. The process is natural selection.
This group generally do well in IQ test, (9) 12-15 points above the (10) value of 100, and have contributed (11) to the intellectual and cultural life of the West, as the (12) of their elites, including several world-renowned scientists, (13) . They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts, (14) , have previously been thought unrelated. The former has been (15) to social effects, such as a p tradition of (16) education. The latter was seen as a (an) (17) of genetic isolation. Dr. Cochran suggests that the intelligence and diseases are intimately (18) . His argument is that the unusual history of these people has (19) them to unique evolutionary pressures that have resulted in this (20) state of affairs.
11（）
A.unconsciously
B.disproportionately
C.indefinitely
D.unaccountably
参考答案：B
解析：
[解题思路] 考查副词。考查结构是：副词修饰动词，“对……做出了______的贡献”。[A]表示“无意识地”；[B]表示“超出正常比例地”；[C]表示“不明确地”；[D]表示“不可数地”。根据上一句提出这个群体的智商比平均值高，而两句话中间用and相连，表示语义一致，可以推出他们的贡献也会很大，由此，只有[B]与这个语义相符合。