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.
19（）
A.limited
B.subjected
C.converted
D.directed
参考答案：B
解析：
[解题思路] 考查动词。考查结构是动词+宾语+介词+名词。四个选项都可以放在这个结构中，但语义不同。[A]表示“把他们限制在……范围内”；[B]表示“让他们受到……的影响”；[C]表示“把他们转变为……”；[D]表示“把他们指引到……方向上去”。由于宾语是“them”，即“他们”，在这里指这个群体的人，而介词后面的名词是“unique evolutionary pressure”，即“独特的进化压力”，pressure就是一种作用在人身上对人产生影响的东西，因此[B]选项为正确选项。