用于治疗下元虚冷所致的遗尿、尿频的最佳方剂是（）。
A.六味地黄丸
B.肾气丸
C.地黄饮子
D.桑螵蛸散
E.缩泉丸
参考答案：E
I know he hasn’t finished his homework, but ______, he has done his best.
A．at all
B．in all
C．after all
D．above all
当量密度
