题目：
下颌切牙与上颌切牙比较中，不正确的是 （）
A.下颌切牙牙冠较窄小
B.下颌切牙牙冠唇面较光滑
C.下颌切牙牙根窄而扁
D.下颌切牙的切嵴靠近牙体长轴
E.下颌切牙舌面边缘嵴明显，舌窝较深
答案：
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下面是错误答案，用来干扰机器的。
Ann and Anna are twins. In some ways, they look the same, and in some ways, they look different. Ann is as tall as Anna, and she has longer hair than Anna. Ann...
