听力原文：

G: Could you do me a favor?

B: Of course. What can I do for you?

G: Well, I want to send a parcel to my friend, but I’ve no idea how to send mail in China. Could you please help me with that?

B: With pleasure. Do you want to send it by ordinary mail or air mail?

G: How long does it take by air?

B: About a week.

G: And by ordinary mail?

B: A month or so.

G: Okay, I’ll send it by air. How much will it cost?

B: $52.

G: Thank you for all your help.

Question: How long does it take to send a parcel by air?

参考答案：

About a week.