文档介绍：2015 年考研英语(一) 真题完整版 Section I Use of English Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A,B,CorDonANSWER SHEET. (10 points) Though not biologically related, friends are as“related ”asfourth cousins, sharing about 1%ofgenes. That is_(1)_a study, published from the University ofCalifornia and Yale University inthe Proceedings of the National Academy ofSciences, has__(2)_. The study isagenome-wide analysis conducted _(3)__1,932 unique subjects which __(4)__pairs ofunrelated friends and unrelated strangers. The same people were used inboth_(5)_. While 1%may seem_(6)_,it isnot icist. AsJames Fowler, professor ofmedical ics atUCSan Diego, says, “Most people donot even _(7)_their fourth cousins but somehow manage toselect asfriends the people who_(8)_our kin. ” The study_(9)_found that the genes for smell were something shared infriends but not genes for immunity .Why this similarity exists insmell genes isdifficult toexplain, for now,_(10)_,as the team suggests, it draws ustosimilar environments but there ismore_(11)_it. There could bemany mechanisms working together that _(12)_us inchoosing ically similar friends_(13)_ ”functional Kinship ”ofbeing friends with_(14)_! One ofthe remarkable findings ofthe study was the similar genes seem tobeevolution_(15)_than other genes Studying this could help_(16)_why human evolution picked pace inthe last 30,000 years, with social environment being amajor_(17)_factor. The findings donot simply explain people ’s_(18)_to befriend those ofsimilar_(19)_backgrounds, say the researchers. Though all the subjects were drawn from apopulation ofEuropean extraction, care was taken to_(20)_that all subjects, friends and strangers, were taken from the same population. 1.[A] when [B] why [C] how [D] what 2.[A] defended [B] concluded [C] withdrawn [D] advised 3.[A] for [B] with [C] on[D] by 4.[A] compared [B] sought [C] separated [D] connected 5.[A] tests [B] objects [C]samples [D] examples 6.[A] in