牙隐裂的治疗方法如下（）
A.调磨牙尖
B.降低咬合
C.干髓治疗
D.根管治疗
E.全冠修复
参考答案：A, B, D, E
下列哪个几何体的截面一定不是圆[ ]
A．圆锥
B．圆柱
C．球
D．棱柱
The answer the teacher，she asked the little boy to try a second time．
A．disappointed
B．disappointing
C．being disappointed
D．having been disappointed
