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Speciation, ______, results when an animal population becomes isolated by some factor, usually geographic.
Speciation, ______, results when an animal population becomes isolated by some factor, usually geographic.
admin
2012-01-05
47
问题
Speciation, ______, results when an animal population becomes isolated by some factor, usually geographic.
选项
A、form biological species
B、biological species are formed
C、which forming biological species
D、the formation of biological species
答案
D
解析
考查同位语成分。空格位于两个逗句之间,是对主语的补充说明,可以是主语的同位语、状语或者是定语从句。选项D是名词短语作同位语,符合题意,为正确答案。选项A是动宾结构,不能修饰前面的主语;选项B为完整的句子,也不能修饰前面的主语;选项C不是定语从句,且逻辑不通。
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专业英语四级
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