拔牙术中最常见的并发症是
A．牙龈损伤
B．牙折断
C．对颌牙折断
D．拔牙出血
E．下牙槽神经损伤
参考答案：B
Is Cindy better at math than Mary? [ ]
A. very
B. a bit of
C. even
古代三部炮制专著的作者、成书朝代与书名是什么？
