听力原文：W: Are you being helped, sir？M: No, not yet. I'm trying to find a pair of shoes.

听力原文：W: Are you being helped, sir？

M: No, not yet. I'm trying to find a pair of shoes. You see, my feet are so big and it's difficult to get my size here.

W: You've come to the right place, sir. Look, we have a variety of styles and different sizes of shoes. May I ask what size do you wear？

M: Oh, 45 or so？ I don't know my exact size in China. Can you measure for me？

What does the man want to buy？

A．A pair of trousers

B．A pair of shoes

C．A coat

D．A dress