He and his wife are of the same ______;they both want their son to go to college.

A．soul

B．spirit

C．heart

D．mind

作为固定桥的基牙，必须是（）。

A.活髓牙

B.牙体组织健康，完整无缺

C.牙周组织健康

D.基牙排列正常无倾斜

E.基牙不能咬合过紧