单选题：What can we learn from the passage?

题目分类：专四
题目类型：单选题
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题目内容：

What can we learn from the passage? A．Mammals developed from the reptiles．
B．The animals that are hatched from eggs have no opportunity for learning．
C．Mammals developed at the cost of the extinction of reptiles．
D．Not all the primates are mammals．

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分类：专四题型：单选题

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分类：专四题型：单选题