— Why do you like winter?

— Because _______________.[ ]

A. I can plant trees

B. I can make a snowman

C. I can swim

以下关于前牙3/4冠切斜面的要求哪项是错误的

A．与牙长轴呈90°角
B．预备出0.35mm以上间隙
C．尖牙要形成近远中两个斜面
D．上前牙由唇侧斜向舌侧
E．下前牙由侧斜向唇侧