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