义齿就位困难的原因不可能是（）。
A．支托不就位
B．基托进入倒凹
C．卡环臂过紧
D．卡环体进入基牙倒凹
E．未按就位道方向戴人
参考答案：A
---Nowadays children are bearing too heavy a learning burden.
---______. So much homework do they have to do that they almost have no time for other activities.
A．So what?
B．It cannot be better
C．Good idea
D．I cannot agree more
哮证缓解期治疗要点是治（）
A.心
B.肝
C.脾
D.肺
E.肾
支托不就位
支托不就位