听力原文：M: Did you take these pictures？ They're very good.
W: Yes, I think they turned out well, too. I like to take my camera with me wherever I go. That way, if I see something interesting, I can snap a picture of it.
M: Carrying a big camera around is too much trouble for me.
W: My camera is really small, though. Here, let me show you.
M: That is a compact camera. But you really must know a lot about photography to get such professional looking results.
W: Not necessarily. This camera is simple to operate.
M: Does this model come with a flash attachment for indoor shots？
W: Better than that. It has a built - in electronic flash, and focusing.
M: That's what I need. When I take pictures they usually come out blurry because I don' t adjust the lenses popery, and I hate photos that are out of focus. Is a camera like yours very expensive？
W: Less than you'd expect. Why don't you check the prices at Hatfield's down the street？ This model was on sale there last week.
M: I think I will. It certainly won't hurt to take a look.
(23)

A. Looking at some photographs.
B. Selling cameras.
C. Teaching a photography class
D. Repairing camera equipment.