听力原文：W: All right, that comes to ＄20.75. Do you have one of our store membership cards? M: What is that? W: It's a free card which allows our customers to receive special discounts. You simply need to fill out our membership application form. M: No, thank you. I'm a little pressed for time. W: How will you be paying for that? Will that be cash or credit? M: I think I'll pay with my card. W: OK. Is that a credit card or a debit card? M: I'm sorry. I don't understand your question. What is the difference? W: A credit card bills you once a month a debit card deducts the money directly from your bank account. M: Well, this is an ATM card issued by my bank. It's connected to my bank account. Can I use that? W: Sure, that's a kind of debit card. Please press the button marked 'DBT' and swipe your card through the machine. M: OK. And now what do I do? W: Please enter your pin number, the identification number which verifies your identity. M: OK. And now? W: Paper or plastic? M: I'm sorry? What did you say? W: I'm going to pack your groceries. What kind of hags would you like, paper or plastic? M: Plastic, please. Wow, you really have to make a lot of decisions in an American grocery store. (20)