They served raw vegetables with the hamburgers and boiled the potatoes ________ fried them.

A．other than

B．more than

C．rather than

D．less than

患儿，7岁，左下第一磨牙近中邻面深龋，探诊敏感，冷测（+），无迟缓性痛。X线片示：患牙根尖未发育完全，根尖无明显暗影。腐质去净后探及针尖大小穿髓孔，此时最恰当的治疗方法是（）

A.根管治疗

B.牙髓切断术

C.直接盖髓术

D.间接盖髓术

E.牙髓摘除术