听力原文：M: Hi, Christie, I brought you some tea. W: Thanks, Mark. Too bad it's not apple tea, like in Turkey. M: You really liked living in Turkey, didn't you? W: Yeah, it was great. M: How do you like the food in Turkey, Christie? W: Oh, the food was fantastic! But people always expected me to eat too much, and I gained a lot of weight 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 learnt 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, I felt rude to refuse. So I ate all the food the host offered me. M: Do you know how to stop the host from offering you food? You must leave some food on your plate. Then 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 the difference. 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. Where are these two speakers from respectively?