患者，男，15岁，面型略突，面下1／3高，ANB2°，下颌支发育不足，前牙切牙合。上下牙列轻度拥挤，磨牙轻近中关系，上下前牙略唇倾。下牙弓方形，4个第三磨牙牙胚存在 。

该患者在治疗中应避免 （）

A.后牙垂直向压入

B.后牙垂直向伸出

C.前牙垂直向压入

D.下颌逆时针旋转

E.以上都不是

—Is Steve watching TV now?

—_____.  He is doing his homework.             [ ]

A. He is watching TV

B. He isn't watching TV

C. No, he isn't

D. Yes , he is