What made scientists think animal can be made to work for us one day?A.Animals are very sk

What made scientists think animal can be made to work for us one day？

A．Animals are very skillful at a circus.

B．They are big and strong.

C．Some animals are as clever as human beings.

D．Animals can be trained because they like to get something as a reward.

请帮忙给出正确答案和分析，谢谢！

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