单选题：Which of the following is NOT one of the features of mammals

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题目类型：单选题
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题目内容：

Which of the following is NOT one of the features of mammals that distinguish them from the reptiles?． A．They're warm-blooded．
B．They have a set of teeth of different shapes．
C．The first period of development of young mammals is within the mother's body．
D．There's some association between mother and infant．

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