功能为穿刺、撕裂食物的为
A.切牙B.尖牙C.前磨牙D.磨牙E.智齿
参考答案:B
When class began, we stopped _______ . [ ]
A. talk
B. talking
C. to talk
D. talked
肾的牛理功能是( )
A.生气B.纳气C.主气D.载气E.调气