—I’d like to make an appointment with Doctor Smith．Would 9:00 tomorrow be all right?

—     ．Her schedule is full in the morning.

A．Yes, she’s free then

B．I’m afraid not

C．You must be joking

D．Wel1, it depends

商业信用是指企业之间相互提供的，与商品的生产和流通有关的信用，具体形式包括（）。

A.现金交易

B.折扣

C.赊销

D.预付

E.分期付款