听力原文：M: Hi, Christi, I brought you some tea. W: Thanks, Mark . Too bad it' s not apple tea, like in Turkey. M: Yeah, too bad! You really liked living in Turkey, didn' t you? W: Yeah, it was great. Turkish people are so warm and generous. M: How do you like the food in Turkey, Christi? W: Oh, the food was fantastic! But you know what I couldn't get used to? How much people expected me to eat, I gained so much weight while I was living there! M: Yes, it' s so polite to be generous. We think people aren' t polite if they don' t offer a lot of food. W: I know. I also learned that it' s not polite for the guest to accept the offer of food at first. M: Yes, that' s definitely true! If you' re the guest, you must refuse the first two offers of food. W: The first time I had dinner at a Turkish home, ! felt rude refusing food. So I ate everything. And I kept on eating. . , and eating. Every time the host offered me something, I ate it. M: Do you know how to stop the host from offering you food? You must leave some food on your plate. That way the host knows that you' re full. W: Oh, is that the trick? In the United States, we usually eat everything. You don' t want the host to think that you don' t like the food. M: That is a difference. You know what happened to me the first time I had inner at an American home? When my hostess offered mo a second helping of food, I said' no' the first time, to be polite. But she didn' t offer again! I was still hungry when I left the house! W: Americans think it' s not polite to insist. We don' t want to force you to eat more if you don' t want more. So if you say' no' the first time, we believe what you say and we don' t offer again. M: I learned that lesson the hard way. Now if someone asks me if I want something, I say 'yes' the first time -- even though I feel rode. W: Would you like something to eat? M: No, no, I am not hungry. W: Ha, ha. Where are each of the two speakers from possibly?