admin (题目选自2015年全国硕士研究生招生考试英语（一）试题)
Though not biologically related, friends are as “related” as fourth cousins, sharing about 1% of genes. That is 1 a study, published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has 2 .
The study is a genome-wide analysis conducted 3 1,932 unique subjects which 4 pairs of unrelated friends and unrelated strangers. The same people were used in both 5 .
While 1% may seem 6 , it is not so to a geneticist. As James Fowler, professor of medical genetics at UC San Diego, says, “Most people do not even 7 their fourth cousins but somehow manage to select as friends the people who 8 our kin.”
The study 9 found that the genes for smell were something shared in friends but not genes for immunity. Why this similarity exists in smell genes is difficult to explain, for now. 10 , as the team suggests, it draws us to similar environments but there is more 11 it. There could be many mechanisms working together that 12 us in choosing genetically similar friends 13 “functional kinship” of being friends with 14 !
One of the remarkable findings of the study was that the similar genes seem to be evolving15 than other genes. Studying this could help 16 why human evolution picked pace in the last 30,000 years, with social environment being a major 17 factor.
The findings do not simply explain people’s 18 to befriend those of similar 19 backgrounds, say the researchers. Though all the subjects were drawn from a population of European extraction, care was taken to 20 that all subjects, friends and strangers, were taken from the same population.
答案：
1-5 ABDCC
6-10 ACDBD
11-15 BDBCA
16-20 DBACA
0
同学们，每天做完题记得在留言区回复“打卡第x天”，看看谁能真正坚持下来，相信坚持到最后的同学都能考上研究生！同学们，冲鸭！！
评论列表 人参与