2015年考研英语一试题答案及解析.pdfVIP

一、SectionⅠUseofEnglish

Thoughnotbiologicallyrelated,friendsareas“related”asfourthcousins,sharing

about1%ofgenes.Thatis(1)_____astudy,publishedfromtheUniversityofCalifornia

andYaleUniversityintheProceedingsoftheNationalAcademyofSciences,has

(2)_____.

Thestudyisagenome-wideanalysisconducted(3)_____1,932uniquesubjectswhich

(4)_____pairsofunrelatedfriendsandunrelatedstrangers.Thesamepeoplewereused

inboth(5)_____.

While1%mayseem(6)_____,itisnotsotoageneticist.AsJamesFowler,professor

ofmedicalgeneticsatUCSanDiego,says,“Mostpeopledonoteven(7)_____their

fourthcousinsbutsomehowmanagetoselectasfriendsthepeoplewho(8)_____our

kin.”

Thestudy(9)_____foundthatthegenesforsmellweresomethingsharedinfriends

butnotgenesforimmunity.Whythissimilarityexistsinsmellgenesisdifficultto

explain,fornow.(10)_____,astheteamsuggests,itdrawsustosimilarenvironments

butthereismore(11)_____it.Therecouldbemanymechanismsworkingtogetherthat

(12)_____usinchoosinggeneticallysimilarfriends(13)_____“functionalkinship”of

beingfriendswith(14)_____!

Oneoftheremarkablefindingsofthestudywasthatthesimilargenesseemtobe

evolving(15)_____thanothergenes.Studyingthiscouldhelp(16)_____whyhuman

evolutionpickedpaceinthelast30,000years,withsocialenvironmentbeingamajor

(17)_____factor.

Thefindingsdonotsimplyexplainpeople’s(18)_____tobefriendthoseofsimilar

(19)_____backgrounds,saytheresearchers.Thoughallthesubjectsweredrawnfroma

populationofEuropeanextraction,carewastakento(20)_____thatallsubjects,friends

andstrangers,weretakenfromthesamepopulation.

1、(1)

A、when

B、why

C、how

D、what

解析：

答案精析：连词辨析题。根据句子结构和选项的特点，可以判断出空格处应填从属

连词引导表语从句。句子主干为Thatisastudyhas.

That指代前文的内容，根据第一句的语义，虽然在生物学上没有血缘关系，但朋友

之间的“