立克次体常用的染色方法为（）。

A.Giemsa、Macchiavello、Gimenez

B.革兰染色、镀银染色、荧光染色

C.Giemsa、荧光染色、Gimenez

D.Macchiavello、荧光染色、Gimenez

E.Gimenez、荧光染色、fontana

－How about having a picnic with me?

－I'd love to, _______ I'm afraid I have no time.[ ]

A. so

B. and

C. but