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.
5（）
A.Only
B.So
C.Even
D.Hence
参考答案：C
解析：
[解题思路] 考查副词。本题有个重点提示词"how ever"，强调上段结尾句和本句的语义上的转折。上段结尾句说“他的观点引起了很大争议”，证明这个人本身就是一个提出新奇观点的人。本句说：然而，______也对自己将要做出的事情胆战心惊。[A]表示“仅有”；[B]表示“因此”；[C]表示“即便”；[D]表示“因此”。[B]、[D]的语义重合导致两者都要排除，而[A]选项造成上下旬语义一致，也要排除。只有[B]能够满足条件。