2. 外语
  3. 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.

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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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