Which of the following statements best explains how anticipating the effects of expansionary monetary policy influences its effectiveness When the effects from a change to a more expansionary monetary policy are fully anticipated, we can expect that:（）

A. the inflation rate will decrease and increase the policy’s effectiveness.

B. interest rates will decrease in the short run and reduce the policy’s effectiveness.

C. contracts will reflect expected higher prices and reduce the policy’s effectiveness.

下列药物中，长于清利头目的是：（）

A.葛根

B.柴胡

C.升麻

D.蔓荆子

E.淡豆豉