听力原文:M: Mum, what will we have for dinner? W: Maybe fish, chicken soup and what do you want to eat? M: Mum, why don't we eat out for a change? W: Oh, that's a good idea. Actually I'm very tired today. M: Mm, let's go to KFC this time. W: Ok, then, you'll drive, won't you? M: Ok, ok. Ah, here we are. Mum, what would you like to have? I'd like a hamburger. W: I want one, too. And some desserts and beverages? M: Yeah, a glass of Pepsi, an ice-cream cone and an apple pie. W: Ok, you go and find the seats. Why did Mum agree to go for dinner?