Assistance dogs are trained to help        disabled to live        more independent life.

A．/; a

B．a; the

C．the; the

D．the; a

上颌6深齲探痛，扣痛（+-），冷测敏感（）。

A.中龋

B.深龋

C.可复性牙髓炎

D.慢性牙髓炎

E.急性牙髓炎