The study 9 found that the genes for small 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 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 peoples 18 to be friend those of similar 19 backgrounds, say the researchers. Though all the subjects were drawn from a population of European extraction, care taken to 20 that all subjects, friends and strangers, were taken from the same population.
1、 [A]what [B]why [C]how [D]when
2、 [A]defended [B]concluded [C]withdrawn [D] advised
3、 [A]for [B]with [C]by [D]on
4、 [A]separated [B]sought [C]compared [D] connected
5 、[A]tests [B] objects [C]samples [D]examples
6、 [A]Insignificant [B]unexpected [C] unreliable [D]incredible
7、 [A]visit [B]miss [C] know [D] seek
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