—I don't know ____ makes her different from others．

—Confidence, I think.[ ]

A．how is it that    

B．how it is that    

C．what is it that    

D．what it is that

药用部位是叶或茎叶，经加工制得的干燥粉末或团块的药材是（）

A.芦荟

B.青黛

C.儿茶

D.海金沙

E.五倍子