单项选择题

[听力原文]8-10
M: Hi. I have some good news for you.
W: What is it
M: The teacher suggested that we go on a trip this Saturday.
W: Oh, wonderful. Where shall we go
M: How about going to the park
W: I don’t think it’s a good place to go to. We can go there another time. We should go farther away this time.
M: Where do you think we should go then
W: How about the reservoir in the suburbs
M: I don’t think it’s a good idea. It’s not safe. Why not go to the mountain instead
W: That sounds good. Let’s go to the mountains to the south of the city.

What are they talking about（）

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