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

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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