—Do:you often see William _  __ _ on the playground?            

—No, but he is often seen _____ Chinese kung fu in the park.           [ ]

A. run, do    

B. run, to do    

C. running, do  

D. running, to do

果皮表皮细胞可见微细的角质线，并有众多油细胞的药材是（）

A.槟榔

B.五味子

C.补骨脂

D.砂仁

E.苦杏仁