.In the open boat,the four men,____was a doctor,met with a storm a tsea.

A．one of which

B．one of who

C．one of whom

D．one of them

患儿，5岁。口腔溃疡反复发作，近日来又作，周围不红，疼痛不甚，形体瘦弱，神疲颧红，舌红，苔少。治疗应首选（）。

A.沙参麦冬汤

B.养胃增液汤

C.益黄散

D.六味地黄丸加肉桂

E.知柏地黄丸加附子