SECTION A CONVERSATIONS
Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow.
听力原文：W: Excuse me, Dr Chandler, do you have a moment？
M: Of course, what can I do for you, Sienna？
W: I wonder if I could change the topic of my paper. You know I was writing about Apono 11, but now I want to write about something else.
M: Oh, I'm a little surprised. On Monday, you were showing me all the pictures of the moon landing you'd found on the Internet. Why did you change your mind？
W: Well, yesterday my friend introduced me to her uncle, who was an excellent astronaut at NASA up until a year ago. That' g really cool! So, I'd like to write about him if that's okay.
M: Yes, that sounds like it'll be a fascinating paper. Make sure that you include some historical facts, though this gentleman's job must have been very interesting, don't forget the historical context or background.
W: I've got some books about the American space program.
M: That sounds like a good start. You could talk a little about the European and Russian space programs, too.
W: I'll do that. I'll see you next week, Dr. Chandler. Thank you!
M: Bye, Sienna. I' look forward to reading your paper.
What are the speakers talking about？

Apollo 11.
B. NASA
C. Spaceship.
D. The paper.