Though not biologically related,friends

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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.16选?A.forecastB.rememberC.understandD.express

选项 A.forecast
B.remember
C.understand
D.express

答案 C

解析 上下文语义衔接+动词辨析此题考查动宾搭配。根据语意。空格后面是一个why引导的宾语从句,意为“人类进化在过去三万年间得以加速的原因”,表示这一研究的结果和意义。能与这一宾语从句构成搭配的只有C选项understand。A选项forecast“预测”与“过去三万年”相矛盾,B选项remember“记住”和D选项“express”均不符合文意。
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