听力原文：M: Look at them! They're the latest Adidas shoes.W: You've already had a pair of

听力原文：M: Look at them! They're the latest Adidas shoes.

W: You've already had a pair of shoes.

M: They cost only ＄100.

W: ＄100？ For a pair of shoes？

M: But they are the latest. I just want to get them. There is a match next week. Oh, Mum, please !

W: Ok, this is the last time.

What's the relationship of the two people？

A．Teacher and student.

B．Father and son.

C．Mother and son.

D．Sister and brother.