[attachimg]48288[/attachimg]
答案是E,我选的D,不明白.
再顶!
我觉得D有几个问题:
1. assisting flies to taste the hydrocarbons on propestive mates to distinguish ... 中的两个to结构表目的有点绕嘴。
2. assist的对象不应该是泛指所有的flies, 它的对象应该只是那些能够taste the hydrocarbons 的flies.
3. hydrocarbons并不能帮助苍蝇们taste the hydrocarbons,它是帮助苍蝇们distinguish their own species from others.
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