全冠修复中不可能对牙髓造成危害的因素是（）
A.牙体预备产热
B.磨牙过多
C.取印模
D.戴暂时冠
参考答案：D
To be honest, I would agree with her, though not _______.[ ]
A. widely
B. actually
C. entirely
D. gradually
食管癌病人出现大量呕血，提示肿瘤侵入( )
A．喉返神经B．肝C．主动脉D．气管E．肺
