M：Can I help you?
W：Yes. I'd like to send this postcard to Australia. How much does it cost by airmail?Q：Where does this conversation most probably take place?A.In a bookstore.B.In a post office.C.In a clothing store.D.In a hotel.
网友回答
B解析选项出现的都是地点。因此只要捕捉到对话中的“postcard”和“airmail”就能较容易判断B是正确