A、A teacher. B、A psychologist C、A librarian. D、A publisher. C从男士的话“书本在24区书架的最上面”，可知男士非常熟悉课本所在的位置，从而判断出他是图书管理员，故选C。

M: Isn’t it rather cold outside, Sally?
W: It is a bit, but I can’t stand the terrible smoke inside. I’d rather stay here if you don’t mind. You know, fresh air makes me more comfortable.
Q: Why does the woman want to stay outside?

W: I’m looking for a textbook for my psychology course. It’s called Introduction to Educational Psychology. Do you have it?
M: Yes, we do. You’ll find it in Section 24 on the top shelf.
Q: What’s the man’s occupation?