掌跖角化-牙周破坏综合征的牙周病损可最早始发于
A．青少年B．青春期C．中年D．乳牙萌出后不久E．恒牙萌出后不久
参考答案：D
牙冠唇、颊、舌面突度的位置是（）
A.前牙在颈1／3；后牙在颈1／3
B.前牙在颈1／3；后牙颊面在颈1／3，舌面在中1／3
C.前牙在颈1／3；后牙颊面在中1／3，舌面在中1／3
D.前牙在中1／3；后牙颊面在颈1／3，舌面在中1／3
E.前牙在中1／3；舌面颊面在中1／3，舌面在中1／3
Had Yeats stopped writing at age 40, probably he ______valued as a minor poet now.
A．would be
B．had been
C．is
D．would have been
