单项选择题

牙列缺损的Kennedy分类，一般情况下其依据是（）

A．基牙的数目
B．支点线形式
C．缺隙部位
D．缺隙部位及鞍基与基牙的关系
E．义齿的支持方式

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单项选择题

乳牙外伤中，对恒牙胚影响最严重的是（）

A．乳牙挫入
B．乳牙冠折
C．乳牙根折
D．乳牙不完全脱出
E．乳牙完全性脱出

单项选择题

M: Did you go shopping today? Where’s the tobacco you promised to bring me?
W: I planned to, but the car was out of order so I did some sewing instead.
Q: What is Jack going to do during his lunch hour?（）

A．She went shopping.
B．She did some sewing.
C．She repaired her car.
D．She bought some tobacco.