Though not biologically related, friends are as “related” as fourth cousins, sharing about
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.
1__________
A.when
B.why
C.how
D.what
2A.defended
B.concluded
C.withdrawn
D.advised
3A.for
B.with
C.on
D.by
5A.tests
B.objects
C.examples
D.samples
4A.compared
B.sought
C.separated
D.connected
12A.drive
B.observe
C.confuse
D.limit
13A.according to
B.rather than
C.regardless of
D.along with
16A.forecast
B.remember
C.understand
D.express
17A.unpredictable
B.contributory
C.controllable
D.disruptive
18A.endeavor
B.decision
C.arrangement
D.tendency
7A.visit
B.miss
C.seek
D.know
8A.resemble
B.influence
C.favor
D.surpass
9A.again
B.also
C.instead
D.thus
10A.Meanwhile
B.Furthermore
C.Likewise
D.Perhaps
11A.about
B.to
C.from
D.like
14A.chances
B.responses
C.missions
D.benefits
15A.later
B.slower
C.faster
D.earlier
6A.insignificant
B.unexpected
C.incredible
D.unbelievable
19A.political
B.religious
C.ethnic
D.economic
20A.see
B.show
C.prove
D.tell
请帮忙给出每个问题的正确答案和分析,谢谢!