【正确答案】
D
【答案解析】[听力原文]23-25
W: Excuse me, waiter, but I think there is something wrong in my soup.
M: What's wrong?
W: Well, I think I saw an insect or something when I was spooning out the noodles. Could you please bring me another bowl?
M: Oh, I'm very sorry. I'll get you another bowl.
W: Thank you.
M: Here you are. A fresh bowl of soup.
W: Thanks a lot.
M: I'm very sorry this happened. I'll tell you that I won't charge you for the soup today.
W: That's great. I can use a free lunch.
M: Good. I hope you come again.
W: I'll do that. Thanks.
23. What is this conversation mainly about?