【答案解析】[解析] 女士认为应该把动物放回大自然，通过改善环境来保护他们。而男土认为动物园可以用来保护濒危动物，又可以作为教育基地。由此可知他们在讨论动物园的功用。
[听力原文] 22-25
W: Well, it's sort of attractive, but in the end I still find it a pretty depressing place.
M: Do you? Why?
W: The animals are out of their natural environment. They're just here for humans to look at. There's nothing natural about it.
M: Yeah, but if we didn't have any zoos, a lot of species would just, well, they'd face extinction.
W: Do you really believe that?
M: Well, don't you? I mean they have good breeding projects for some species that are dying out. Um, anyway, I think, there's a trend towards developing zoos to become education centers, stimulating information for kids and displays, and that kind of thing.
W: What we need to do is to take care of the natural environment, make sure that they've still got a place where they can live in the wild.
M: Well, yeah, OK. But it's just not happening, is it? I think in reality you've got to have zoos.
W: Well, I just can't agree with that. I mean, what is the pleasure in watching animals pacing up and down in cages?
M: Look, zoos are changing. Some older zoos put animals in cages, but what about safari parks? The animals are fine there. They've got a lot of space and people see them in a much more natural setting.
W: Well, maybe you're right.