题目内容：

When visiting a friend， we don’t express ourselves directly， but it’s quite different in western countries. In the USA， which of the following doesn’t fit its custom?

A.a: Would you like something to drink?

b: I am not thirty.

B.a: May I get something to drink for you?

b: Yes， please.

C.a: Would you like some more eggs?

b: No， thanks. I am full.