A、Husband and wife. B、Lawyer and client. C、Saleswoman and customer. D、Waitress and customer. D对话中，女士说我能为你做些什么?男士说他都等了四十分钟了，可点的饭菜

W：Have you been to the new fitness club on the comer，William? They say it is a good place to do exercise．
M：Yeah，I’ve heard of it．I went there myself yesterday．It has almost the best equipments in the town．and I am going to start an exercise class after work．
Q：What are they talking about?

W：Yes? What can I do for you, sir?
M：I have been waiting for almost forty minutes and my meal hasn’t arrived yet．What keeps your kitchen so busy?
Q：What’s the relationship between the two speakers?