2015年考研英语一真题及答案解析

2015年考研英语一真题及答案解析

(1~20/共20题)完形填空

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.

第1题

A.when

B.why

C.how

D.what

第2题

A.defended

B.concluded

C.withdrawn

D.advised

第3题

A.for

B.with

C.on

D.by

第4题

pared

B.sought

C.separated

D.connected

第5题

B.objects

C.samples

D.examples

第6题

A.insignificant

B.unexpected

C.unbelievable

D.incredible

第7题

A.visit

B.miss

C.seek

D.know

第8题

A.resemble

B.influence

C.favor

D.surpass

第9题

A.again

B.also

C.instead

D.thus

第10题

A.Meanwhile

B.Furthermore

C.Likewise

D.Perhaps

第11题

A.about

B.to

C.from

D.like

第12题

A.drive

B.observe

C.confuse

D.limit

第13题

A.according to

B.rather than

C.regardless of

D.along with