A: Good morning. Can I help you? B: Yes, please. I want a kilo of tomatoes, twelve eggs and a pen. A: OK. Four yuan a kilo of tomatoes, fifty fen an egg and seven yuan a pen. Is that all? B: I want some ice cream. How much are they? A: Nineteen yuan, please. B: Here is the money. A: Thank you very much. B: That's all right. 答案不唯一