A、Preparing a picnic. B、Going shopping. C、Cooking dinner. D、Having a party. A对话讨论的是应该为周六野餐购买什么东西的问题，故A项正确。

M: Do you think I could borrow your car to go groceries shopping? The supermarkets outside the city are so much cheaper than the one by the school. But they are so far away. I’ d like to pick up anything you need.
W: Well, I don’ t like to let anyone else drive my car. Tell you what, why don’ t we go together? That way I can learn the way.
Q: What does the woman mean?

W: Dave. I’ m going to the supermarket to pick up food and drink for Saturday’ s picnic later. Any suggestions?
M: Well, everyone has been talking about having a barbecue down by the river, so why don’ t you pick up some hamburger and hot dogs?
Q: What are they talking about?