A、A comparison of fish as a cold-blooded animal with warm-blooded animals. B、The difference between water animals and land anima

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问题  

选项 A、A comparison of fish as a cold-blooded animal with warm-blooded animals.
B、The difference between water animals and land animals.
C、The importance of fish to human beings.
D、How water has affected the development of fish.

答案D

解析
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