the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET. (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 Univers乌海癫痫病治疗医院哪家好ity in the Proceedings of the National Academy of Sciences, has__(2)_.
The study is a genome-wide analysis conducted _(3)__1,932 uniue 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雅安癫痫病应该如何治疗 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 d药物治疗癫痫，病情还会经常发作，应该怎么办呢？raws 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 evo内江癫痫病小发作治疗lution 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 str