单选题
专四
2014-02-24
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．
参考答案
D
答案解析
D。本题需根据选项一一定位于原文判断答案。根据题干信息词the features ofmammals，distinguish以及the reptiles,将答案锁定在文章第二段。第二段指出，哺乳动物有许多特征区别于爬行动物，尽管哺乳动物是由爬行动物进化而来的。哺乳动物为温血动物，它们的牙齿形状各异以行使不同的功能，其早期发育在母体内完成，且为胎生。该段还提到，哺乳动物靠母乳喂养，这加强了母亲和婴儿之间的联系，但这并不表明爬行动物母婴之间没有联系，故选D。
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