—You can use MSN to talk with Kevin on the Internet.

—I know. But can you tell me _______?[ ]

A. what I can use it

B. how can I use it

C. why can I use it

D. when I can use it

医疗服务价格定价的基本原则不包括（）。

A.社会效益优先原则

B.经济效益优先原则

C.保障基本医疗服务原则

D.合理补偿原则

E.市场调节与宏观调控相结合原则