Is in the living room?[ ]
A. her
B. I
C. she
答案：C
- Could you walk me to the railway station?
-____.I've got nothing to do anyway.
A．It depends
B．No problem
C．Forget it
D．Never mind
窝沟封闭术的基础是
A．酸蚀技术的应用B．釉质结构、牙本质结构的了解C．酸的发明D．粘结树脂的发明E．酸蚀技术和粘结树脂的发展与完善
