Conversation Two
M: Have you noticed the new dustbin downstairs, at the entrance of the main building?
W: Yeah, of course. It looks funny, though, like a battery. What's it for? Is it really for garbage?
M: Not really. Actually it's a dustbin for used batteries.
W: Used batteries? What do you mean by that? Why do we need a special dustbin for used batteries?
M: Well, you know there are still a lot of heavy metals left in used batteries, so by recycling the batteries, [23]we can not only make full use of the metals left, but also prevent the environment from being polluted.
W: Oh, I see. Can this work? Our efforts are too insignificant.
M: Even though we are not ecologists or biologists, there is still a lot we can do. [24]The Student Union is sponsoring a one-month program called "Green Movement", which is aimed at making more and more students aware of serious environmental problems we are facing now.
W: Sounds quite exciting-"Green Movement". What, for example, can I do?
M: Well, quite a lot. For one thing, you can stop using those plastic meal-boxes and disposable wooden chopsticks. Plastic meal-boxes do great harm to the environmentand disposable chopsticks are a big waste of forest resources. [25]Well, there will be a lecture tomorrow afternoon at four o'clock. You may attend if you are interested.
W: [25]Tomorrow afternoon... let me think... yeah, I happen to be free. I will go there.

Questions 23 to 25 are based on the conversation you have just heard.
23. What are the two speakers doing?
正确答案：B
解析：主旨题。四个选项的话题对话中都提到了，但整个对话由新垃圾箱引出电池回收问题，并进而谈到开展环保活动，最后男士告诉女士明天有一个讲座，可以让人们更深刻地认识环境问题。选项A、D都是围绕B项内容展开，只是对话的部分内容，不能用于概括大意，故答案为B。而C错在collect。
24. What is the purpose of the "Green Movement"?
正确答案：D
解析：细节题。男士提到“绿色运动”，它是学生会主办的为期一个月的活动，旨在让更多的学生意识到环境污染的严重性。因此，答案应该是D。其他选项都是具体做法，而且不完全与该运动相关。本题答案所在的句子较长，信息量大，考查学生的基本功。考生平时应有意识地多听长句，熟悉其结构组成，考试时遇到方能得心应手。
25. What will the woman do tomorrow afternoon?
正确答案：A
解析：细节题。男士说明天下午有个讲座，如果有兴趣的话可以参加。女士回答说，明天下午正好有空，会去的，所以答案为A。符合“听到什么选什么”的原则。C是长期行为，不是明天下午要做的事。