It is uncertain ___ side effects these weight-loss drugs will bring about, although hundreds of

thousands of patients have taken it. [ ]

A. that              

B. whether          

C. how              

D. what  

用于治疗心肾两虚所致的尿频、遗尿的最佳方剂是（）。

A.六味地黄丸

B.肾气丸

C.地黄饮子

D.桑螵蛸散

E.缩泉丸