Bill likes playing _________ pingpong, but he doesn't like playing _________ guitar.[ ]

A. a; a

B. /; the

C. the; the

D. the; /

下列各项，具有"泌别清浊"功能的是（）

A.三焦

B.大肠

C.小肠

D.膀胱

E.心包