2. 考研
  3. Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is【B1】______1 a stu

Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is【B1】______1 a stu

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问题     Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is【B1】______1 a study, published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has【B2】______
    The study is a genome-wide analysis conducted【B3】______1, 932 unique subjects which【B4】______pairs of unrelated friends and unrelated strangers. The same people were used in both【B5】______
    While 1 % may seem【B6】______, it is not so to a geneticist. As James Fowler, professor of medical genetics at UC San Diego, says,"Most people do not even【B7】______their fourth cousins but somehow manage to select as friends the people who【B8】______our kin."
    The study【B9】______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. 【B10】______, as the team suggests,it draws us to similar environments but there is more【B11】______it. There could be many mechanisms working together that【B12】______us in choosing genetically similar friends【B13】______"functional kinship" of being friends with【B14】______!
    One of the remarkable findings of the study was that the similar genes seem to be evolving 【B15】______than other genes. Studying this could help【B16】______why human evolution picked pace in the last 30,000 years, with social environment being a major【B17】______factor.
    The findings do not simply explain people’s【B18】______to befriend those of similar【B19】______backgrounds, say the researchers. Though all the subjects were drawn from a population of European extraction, care was taken to【B20】______that all subjects, friends and strangers, were taken from the same population.
【B19】
选项 A、political
B、religious
C、ethnic
D、economic
答案C
解析 本题考查形容词用法。Political意为“政治的；党派的”；religious意为“宗教的；虔诚的”；ethnic意为“种族的；人种的”；economic意为“经济的，经济上的”。根据下文中出现的all the subjects were drawn from a population of European extraction，判断此处应是指“拥有相同的种族背景”。
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