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.

盐炙能增强补肝肾作用的药物是

A．橘核

B．知母

C．荔枝核

D．杜仲

E．砂仁