— Mike got “F” in his history test.   一        ? He has been working so hard on it.

A．How come

B．So what

C．What for

D．Why not

左归丸和右归丸两方的组成药物中均含有（）

A.炮附子、干地黄

B.炮附子、肉桂

C.枸杞子、菟丝子

D.山茱萸、牛膝

E.鹿角胶、龟板胶