Though not biologically related,friends

题库2022-08-02  31

问题 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,has__(2)_.The study is a genome-wide analysis conducted_(3)__1,932 unique subjects which__(4)__pairs of unrelated friends and unrelated strangers.The same people were used in both_(5)_.While 1%may seem_(6)_,it is not so to a geneticist.As 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 study_(9)_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,_(10)_,as the team suggests,it draws us to similar environments but there is more_(11)_it.There could be many mechanisms working together that_(12)_us in choosing genetically similar friends_(13)_”functional Kinship”of being friends with_(14)_!One of the remarkable findings of the study was the similar genes seem to be evolution_(15)_than other genes Studying this could help_(16)_why human evolution picked pace in the last 30,000 years,with social environment being a major_(17)_factor.The findings do not simply explain people’s_(18)_to befriend those of similar_(19)_backgrounds,say the researchers.Though 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.18选?A.endeavorB.decisionC.arrangementD.tendency

选项 A.endeavor
B.decision
C.arrangement
D.tendency

答案 D

解析 上下文语义衔接+名词辨析此处进一步陈述这一研究的结论。A选项endeavor“努力”,B选项“决定”,C选项“安排”,D选项“倾向”。本文的主旨重在解释人们交朋友时不自觉的一种倾向,而非通过人为的有意识的举动来选择朋友。因此正确答案为D。
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