根据对话内容排序：小题1:______小题2: _____ 小题3: _____ 小题4: _____ 小题5: ______

A．Anything else?

B．Yes. I would like to have the beef, please.

C．OK. I will get the things ready for you soon.

D．May I take your order, sir?E. A tomato salad and a bottle of beer.

印刷中有些物质会引起乳化，称为乳化剂。下列物质中哪个不是乳化剂？（）

A、电介质

B、表面活性物质

C、烷类

D、固体粉未