2021年考研初试备考还有最后的近两个月时间，相信大家也都在紧张的复习当中。在复习时，多做练习题可以让我们更加了解考试内容。下面，帮考网为大家带来考研初试的一些模拟试题，正在备考的小伙伴赶紧练起来吧。

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 1932 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 in olfactory genes is difficult to explain, for now. 10 Perhaps, as the team suggests, it draws us to similar environments but there is more 11 it. There could be many mechanisms working in tandem that 12 us in choosing genetically similar friends 13 than "functional kinship" of being friends with 14 !One of the remarkable findings of the study was that the similar genes seem to be evolving 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 corroborate 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. The team also controlled the data to check ancestry of subjects.

Section II Reading Comprehension

1、What

2、Concluded

3、On

4、Compared

5、Samples

6、Insignificant

7、Know

8、Resemble

9、Also

10、Perhaps

11、To

12、Drive

13、Ratherthan

14、Benefits

15、Faster

16、understand

17、Contributory

18、Tendency

19、Ethnic

20、see

以上就是帮考网为大家带来的全部内容，希望能给大家一些帮助。帮考网提醒：以上内容仅为参考，在做试题练习时，小伙伴们还是要以考研大纲为准，有针对性的去做题哦。最后，帮考网预祝参加2021年考研初试的小伙伴都能取得优异的成绩。