上颌中切牙髓室缺乏
A．髓室底
B．髓室顶
C．近中髓壁
D．舌侧髓壁
E．髓角
参考答案：A
下列SQL语句中，用于修改表结构的是( )。
A．ALTER
B．CREATE
C．UPDATE
D．INSERT
I have _ _ to do today. [ ]
A. anything important
B. something important
C. important nothing
D. important something
