The chemical factory is far away in the mountains. It is nearly ____ ride from the city.

A．a six-hour

B．a six hour’s

C．six hour’s

D．six hour

下列哪项是毛氏第Ⅴ类错（）。

A.个别牙错

B.开

C.前牙反

D.后牙锁

E.深覆、深覆盖