牙周炎患者正畸治疗（）
A.矫正所有位置不正的牙
B.J形钩关闭前牙间隙
C.达到磨牙中性关系
D.达到尖牙中性关系
E.尽量少拔牙
参考答案：E
The boy has to wear ____ uniform at his school. [ ]
A. his
B. her
C. /
D. some
胃、十二指肠溃疡合并出血的好发部位在（）
A.胃大弯或十二指肠后壁
B.胃小弯或十二指肠后壁
C.胃大弯或十二指肠前壁
D.胃小弯或十二指肠前壁
E.胃体
