服务过程标准中要求，收付客户钱款应双手接收，并做到（）。
参考答案：唱收唱付
根据实际情况回答下列问题。
1. How old are you?
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2. What's it?
3. I have a sandwich and an apple for lunch. How about you?
4. Would you like some dumplings?
5. Can you make soup?
什么是食醋，是怎样分类的？
