— Tom, you are  smoking again?   

— ____ ? It's none of your business.    [ ]

A. So what    

B. How come

C. Why not    

D. What for

具有破血祛瘀，行气止痛之功的药组是()

A．乳香，没药

B．桃仁，红花

C．益母草，丹参

D．三棱，莪术

E．凌霄花，月季花