牙拔除时适宜使用旋转力的牙是（）
A.上颌中切牙
B.下颌中切牙
C.上颌第一磨牙
D.下颌第三磨牙
E.第一前磨牙
参考答案：A
-Which of the two computer games did you prefer?
-Actually I didn't like_______. [ ]
A. both of them
B. either of them
C. none of them
D. neither of them
青年初期是个体在心理、生理和社会性上向成年人接近的时期。（ ）
