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  3. Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is【C1】______a study

Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is【C1】______a study

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问题     Though not biologically related, friends are as "related" as fourth cousins, sharing about 1% of genes. That is【C1】______a study, published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has【C2】______.
    The study is a genome-wide analysis conducted【C3】______1,932 unique subjects which【C4】______pairs of unrelated friends and unrelated strangers. The same people were used in both【C5】______.
    While 1% may seem【C6】______, it is not so to a geneticist. As James Fowler, professor of medical genetics at UC San Diego, says, "Most people do not even【C7】______their fourth cousins but somehow manage to select as friends the people who【C8】______our kin."
    The study【C9】______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.【C10】______, as the team suggests, it draws us to similar environments but there is more【C11】______it. There could be many mechanisms working together that【C12】______us in choosing genetically similar friends【C13】______"functional kinship" of being friends with【C14】______!
    One of the remarkable findings of the study was that the similar genes seem to be evolving【C15】______than other genes. Studying this could help【C16】______why human evolution picked pace in the last 30,000 years, with social environment being a major【C17】______factor.
    The findings do not simply corroborate people’ s【C18】______to befriend those of similar【C19】______backgrounds, say the researchers. Though all the subjects were drawn from a population of European extraction, care was taken to【C20】______that all subjects, friends and strangers, were taken from the same population.
【C9】
选项 A、again
B、also
C、instead
D、thus
答案B
解析 考查逻辑关系。句子开头用The study…，显然这是对上文话题的继续阐述，前文指出研究发现朋友与我们有着大约1％的基因关系，而空处所在句the genes for smell were something shared in friends在进一步讨论该话题，前后之间是顺接关系，故答案为B．also“也”。again“再一次，又”，instead“相反”，thus“因此”均不符合逻辑。
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