Which of the following does NOT imply an informationally efficient market（）

A. Many profit-maximizing participants, each acting independently of the others, analyze and value securities.

B. The timing of one news announcement is independent of other news announcements.

C. A risk-free asset exists, and investors can borrow and lend an unlimited amount at the risk-free rate.

哪种贫血可进行骨髓移植治疗

A．巨幼细胞性贫血

B．再生障碍性贫血

C．自身免疫性溶血性贫血

D．慢性病贫血

E．缺铁性贫血