肾功能不全引起的慢性贫血采用哪种药物治疗疗效显著（）

A.血液透析

B.反复输血

C.口服铁剂

D.促红细胞生成素

E.VitB₁₂肌注

The less the surface of the ground yields to the weight of the body of a runner, () to the body.

A. the stress it is greater

B. greater is the stress

C. greater stress is

D. the greater the stress