--- _______?

--- I have a cold and I don’t want to eat anything.

A．How are you

B．What can I do for you

C．What’s the matter with you

D．How do you like it

¹H-NMR可以提供哪些信息

A．质子类型

B．质子数目

C．相邻原子

D．相邻原子团

E．碳骨架