Ichthyology, Ais a branch of zoology dealing with fish, has made important Bdiscoveries about the Ceffects of pollution on the w

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问题 Ichthyology, Ais a branch of zoology dealing with fish, has made important Bdiscoveries about the Ceffects of pollution on the world’s fish Dresources.

选项 A、 
B、 
C、 
D、 

答案A

解析 Omit is, a verb, which is incorrect before a noun structure that is an appositive.
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