He is      _ manager, that is, he has succeeded      _ his work.[ ]

A. a successful; in          

B. success as; with

C. successful; with        

D. a success; in

患儿1岁，男性。因长期腹泻引起营养性缺铁性贫血，近一个月来患支气管肺炎，Hb40g/L，BBC 2.5×l012/L，应首先采用哪项措施

A．硫酸亚铁口服

B．肌注右旋糖酐铁

C．增加富含铁质的饮食

D．抗感染治疗

E．输血