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2015年全国硕士研究生入学统一考试
英语（一）试题
Section I   Use of English
Directions:
Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (10 points)
①Though not biologically related, friends are as “related” as fourth cousins, sharing about 1% of genes. ②That is 1 a study, published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has 2 .
①The study is a genome-wide analysis conducted 3 1,932 unique subjects which 4 pairs of unrelated friends and unrelated strangers. ②The same people were used in both 5 .
①While 1% may seem 6 , it is not so to a geneticist. ②As 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.”
①The study 9 found that the genes for smell were something shared in friends but not genes for immunity. ②Why this similarity exists in smell genes is difficult to explain, for now. ③ 10 , as the team suggests, it draws us to similar environments but there is more
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11 it. ④There could be many mechanisms working together that 12 us in choosing genetically similar friends 13 “functional kinship” of being friends with 14 !
①One of the remarkable findings of the study was that the similar genes seem to be evolving 15 than other genes. ②Studying this could help 16 why human evolution picked pace in the last 30,000 years, with social environment being a major 17 factor.
①The findings do not simply explain people’s 18 to befriend those of similar 19 backgrounds, say the researchers. ②Though 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