主要含有香豆素类成分的药材是（）

A.连翘

B.厚朴

C.人参

D.五味子

E.秦皮

--- “What will you do during the summer holiday?”

--- “I don’t know, but it’s high time _____ something.”

A．I’m deciding

B．I’ll decide

C．I decided

D．I decide