— What animal feeds on plants only?— A does. But sadly, it’s more and more difficult for

— What animal feeds on plants only?
— A does. But sadly, it’s more and more difficult for them to find enough food.

A B C D

解析：句意：什么动物仅以植物为食？--斑马，但是难过的是对于他们来说找到足够的食物越来越难了，A 是狼 B 斑马 C 老虎 D熊只有斑马是食草动物，故选B

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