听力原文:M: What food shall I buy today? W: I want a green salad for lunch. For supper, I want some meat. M: What kind of meat, madam? W: Beefsteak. M: How much beefsteak do you want? W: About 2 pounds. Do we have enough bread and potatoes? M :We have enough bread. But we don't have enough potatoes. Shall ! buy some potatoes? What do they eat for lunch and for supper?