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2015年全國碩士研究生入學(xué)統(tǒng)一考試英語（一）試題
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)
?、賂hough 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.
?、賅hile 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.”
?、賂he 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.③10,as the team suggests,it draws us to similar environments but there is more 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!
?、貽ne 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.
?、賂he 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 population.③The team also controlled the data to check ancestry of subjects.
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