Everybody showed great respect to the old doctor, who devoted everything he had to _____ the

poor conditions of the local hospital. [ ]

A. improving        

B. improve          

C. improved        

D. being improved

依被照体体位与胶片的位置关系命名的摄影体位是（）

A.肩关节前后位

B.胸部左前斜位

C.股骨水平侧位

D.腹部倒立侧位

E.头颅后前位