A、He has trouble stopping. B、There are too many rocks. C、Going uphill is difficult. D、There are too many curves. A

W: What a beautiful day! It’s a shame to stay in side all day.
M: Do you have a suggestion?
W: Actually, I guess I do. Why don’t we go for a run?
M: Well, I really don’t like running.
W: OK, then. How about roller skating? Don’t you have a pair of skates?
M: Now that you mention it, I do have a pair. But where could we skate that’s not an indoor skating rink?
W: You know the bike path on the other side of campus-the one that goes through the trees?
M: Yes?
W: Well, I’ve seen people skating there, and it’s a really pretty area.
M: That’s true, but I also remember that there are some hills over there.
W: So what?
M: So, I don’t mind going up hills, but I hate going down them, because I’m not good at stopping. In fact, the only way for me to stop is to jump off the path and hope I land on some thing soft.
W: Tell you what. I’ll show you how I stop, and if it doesn’t work you’ll still have the grass to fall back on.
M: OK. I’m ready, but I think we should bring something to drink.
W: Good ideal What’s in the dorm fridge?