听力原文：W: I think we ought to turn around and head back down the trail.M: Tired, after j

听力原文：W: I think we ought to turn around and head back down the trail.

M: Tired, after just a few miles？

W: Not at all, but those are cumulonimbus clouds building up there.

M: So, I don't really care if it gets cloudy. The sun's been pretty strong.

W: Right, but those clouds mean a thunderstorm, lots of rain and sometimes even hail with those kinds of clouds.

M: That doesn't sound so great, but I thought that these cumulus were fair weather clouds.

W: You are thinking of cumulus clouds I bet. Those are definitely cumulonimbus.

M: How on earth did you ever learn all that, from a meteorological course？

W: I'm an English major, but growing up on a farm, you learn a lot about weather.

M: You convince me, let's turn back, and maybe on the way down, you can give a lesson on clouds.

W: A sure thing, but let's get going.

(23)

A．On a mountain trail.

B．In a classroom.

C．At a weather station.

D．At a planetarium.