2015年考研英语一真题

Section I Use of EnglishDirections:Read the following text.Choose the best word(s)for each numbered blank and markA,B,C or D on the 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 Universityof California and Yale University in the Proceedings of the National Academy ofSciences,has 2.The study is a genome-wide analysis conducted 3 1,932 unique subjectswhich 4 pairs of unrelated friends and unrelated strangers.The same peoplewere 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 even7 their fourth cousins but somehow manage to select as friends the peoplewho8 our kin.”The study 9 found that the genes for smell were something shared infriends but not genes for immunity.Why this similarity exists in smell genes isdifficult to explain,for now.10,as the team suggests,it draws us to similarenvironments but there is more 11 it.There could be many mechanismsworking together that 12 us in choosing genetically similar friends 13"functional kinship"of being friends with 14One of the remarkable findings of the study was that the similar genes seemto be evolving 15 than other genes.Studying this could help 16 whyhuman evolution picked pace in the last 30,000 years,with social environmentbeing a major 17 factor.The findings do not simply explain people's 18 to befriend those ofsimilar 19 backgrounds,say the researchers.Though all the subjects weredrawn from a population of European extraction,care was taken to 20 thatall subjects,friends and strangers,were taken from the same population.1.本资料由阁宝店铺：光速考研工作室整理汇编如需题型分类版试题可进店获取