制备洞形时．感染的软化牙本质未去净，预防性扩展不够，易导致（）
A．意外露髓
B．充填体脱落
C．继发龋
D．乳牙内吸收
E．充填体过高
参考答案：C
属于“十九畏”的配伍药组的是（）。
A.川乌与草乌
B.桃仁与红花
C.官桂与赤石脂
D.乌头与贝母
E.甘草与甘遂
—Jim, are you ________this Saturday?
—Oh, sorry. I need to go to the bookshop ________the bank on Saturday. [ ]
A. convenient; and
B. convenient; as well as
C. available; with
D. available; as well as
