— I heard they went skating in the mountains last winter.

— It _____ true because there was little snow there.

A．may not be

B．won’t be

C．couldn’t

D．mustn’t be

大柴胡汤中配伍大黄的主要作用是（）。

A.活血化瘀

B.内泻热结

C.疏肝敛阴

D.缓急止痛

E.清热去火