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去百度文库,查看完整内容>内容来自用户:背几句诗2015研究生入学考试英语一真题答案解析Section 1 Use of English Directions:Readthefollowing text. Choose the best word(s) for each numbered blankandmark[A], [B], [C] or [D] on ANSWER SHEET 1. (10 points) 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, has2 . The study is a genome-wide analysis concted 3 1932 unique subjects which 4 pairs of unrelated friends and unrelated strangers. The same people were used in both5 . While 1% may seem6 ,it is not so to a geneticist. As co-author of the study 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 team also developed a "friendship score" which can predict who will be your friend based on their genes. The study 9 found that the genes for smell were something shared in friends but not genes for immunity. Why this similarity in olfactory genes is difficult to explain, for