[speaker001:] Mary, come here. I've found the book our teacher recommended us to buy last week.
[speaker002:] Really? How much is it? Oh, it's 42 yuan! How expensive!
[speaker001:] You know, it is the best seller for this year. It has had its fifth impression since its publication early this year.
[speaker002:] How come? I have never seen such a popular book before.
[speaker001:] Wait a minute. I found there were two printings. The paperback books must be much cheaper.
[speaker002:] You are right. Let's buy the cheaper one.