With a lot of difficult problems () , the manager felt worried all the time.

A. settled

B. to be settled

C. settling

D. to settle

患者男，40岁。因长期疲乏无力、头晕、眼花而就诊。检查：Hb80g/L，RBC3.28×10¹²/L，心肺正常，以贫血待查入院。入院后检查：血清铁、血清铁蛋白、骨髓含铁血黄素、铁粒幼细胞均低于正常，但总铁结合力高于正常。

彻底治愈本病的措施是（）

A.增加营养

B.少量输血

C.纠正偏食

D.体育锻炼

E.补充铁剂