听力原文：M: Hi, Susan, you are so lucky to be done with your final exams and term papers. I still have two more finals to take. W: Really? M: Yeah, so what are you doing this summer, anything special? W: Well, actually yeah. My parents have always liked taking my brother and me to different places in our country. You know, places with historical significance. I guess they wanted to reinforce the stuff we learned in school about history. And so even though we are older now, they still do once in a while. M: Oh so where are you going this summer? W: Well, this summer it's finally going to be Yan'an. M: Finally? You mean they never took you yet? I mean Yan'an it's probably the most famous revolutionary base in the country. It's only a couple of hours ride by train. I think that would be one of the first places where they should have taken you. I have been there a couple of times. W: We were going to go about five years ago, but something happened. I cannot remember what changed our plans. Yeah, don't ask me what it was, but we ended up not going anywhere that year. I hope that doesn't happen again this year. M: I wrote a paper about the revolutionary activities in Yan'an last semester for a history class after I visited it for the fifth time last summer. The trip really helped a lot. W: And now I'm even more excited to see the place. (20)