【正确答案】 C

【答案解析】[听力原文]11-13 W: I want to mail this letter overseas. M: OK, Ma'am. I'll have to weight it first. All right, it's not over-weight. That's 5.5 yuan for overseas mail. W: That's not expensive. How long does it take for a letter to get to the U. S.? M: It all depends. It usually takes four or five days. W: That's wonderful, h used to take more than a week when I was staying here six years ago. Well, I want to register it. M: All right. It probably takes a little longer to get there though. W: Yes, I know. Well, please let me have a post office box. M: That's OK. Fill out this form, please. W: How much is the rent per month? M: It's 100 yuan per year. W: Here is the form and money. M: OK. Here is the key for you. The number is on it. Any more requests? W: No, thank you.