【正确答案】 B

【答案解析】原文：W: Good morning. Can I help you?M: Good morning. I think there should be a room booked for me in the name of Tony Marshall.W: Um...just a moment. Yes, one single room with a bathroom?M: That’s right. I’m here to attend the Sun Sea and Sand Exhibition. Does that mean I get a discount?W: Yes, there is a 20% discount. Is it for 10 days? Is that right?M: Yes, until the 15th. That’s 10 days.W: Good. Now, I need to have your credit card. But when you check out, you can pay by card or cash or check, as you wish.M: Okay, thanks. I’ll pay by this same card then.W: All right. Mr. Marshall, you are in Room 207. Here is the key. The lift is over there on your right.M: Thank you very much.