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.
【B5】
选项 A、tests
B、objects
C、samples
D、examples
答案C
解析 本题考查名词用法。Test意为“试验；检验”；object意为“对象；目标；物体”；sample意为“样本；例子”；ex—ample意为“例子；榜样”。此句应是表达“所有实验个体都会被重新分在不同对照组进行分析”。而sample所表示的“样本”指的是其他的都与这个“样本”在质量、性质和设计上相同；example所对比的通常是作为有典型的、能说明问题的、有代表性的例子。
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