听力原文：M: There's a letter here for you, mum.
W: Thanks, Jack. Oh, no, not another telephone bill. I hope it is not as much as last time.
M: How much is it？
W: $130.94 for three months. How can it be so much？ Your father and I hardly make any calls. You must have been using the phone all the time.
M: Only to speak to my friends.
W: Jack, I don't think you realise just how much it costs when you telephone your school friends, and you speak to them for so long, especially during the day. Why can't you call them after 6 pm when it is cheaper. Your father is going to be upset when he finds out.
M: I'm sorry.
W: Well, being sorry just isn't good enough. I've told you often enough not to use the telephone so much. If you had to pay the bill you wouldn't be so irresponsible with the telephone. You see your friends every day. Why do you need to phone them up as well？
M: I don't know, Mum. We just have so much to share.
W: Ok. You'll have to pay half of this bill out of your wages from your Saturday job.
M: But Mum, that's not fair.
W: To make you learn a lesson, I have to make you pay half of this bill.
M: Oh, no, Mum, it'll take me weeks to pay you half of $130.94.
(20)

A. How to avoid making too many phone calls.
B. The son's making long calls with his friends.
C. How to make more money from the Saturday job.
D. Who should pay half of the telephone bill.