[听力原文]9-10M: Look, how tall the mountain is! Let’s climb up to the top.W: Well, I’m feeling a bit tired.M: Come on! You can’t really enjoy the beauty of the mountain if you don’t climb.W: OK. Let’s go. Wow! The scenery here is really marvelous! The flowers, the trees, and the fresh air!M: I’ve told you that climbing is rewarding!W: I feel as if I were in a different world.M: Seeing is believing!W: You are right.M: Are you feeling tired nowW: No. I’m really enjoying the beauty of the nature. Let’s make a last eftort to the top. What are the two speakers doing（）

A. They are talking about the scenery.
B. They are enjoying the flowers.
C. They are arguing about something.
D. They are climbing up the mountain.