下列头孢菌素类哪些属于国家的基本药物（）

A.头孢拉定

B.头孢挫林

C.头孢曲松

D.头孢氨苄

E.头孢呋辛

Speaker A: Excuse me, Mr. Black, can you spare me a few minutes There’s something I’d like to speak to you about. I won’t keep you long.
Speaker B: （）。

A. What do you want to talk with

B. Yes, go ahead.

C. What’s the matter

D. Oh, nice to see you, John.