下列牙位中常见双牙根的是（）
A.上下中切牙
B.上下侧切牙
C.上下尖牙
D.上第一双尖牙
E.下第一双尖牙
参考答案：D
You did very well.Have you his suggestion to improve your work? [ ]
A.offered
B.adopted
C.provided
D.received
泽泻可治疗（）。
A.头痛
B.宫颈癌
C.高脂血症
D.肺心病
E.阿狄森病
