【正确答案】 A

【答案解析】[听力原文] M: Hi, Diana. I'm surprised to see you on the city bus. Your car in the shop? W: No. I've just been thinking a lot about the environment lately. So I decided the air will be a lot cleaner if we all use public transport when we could. M: I'm sure you are right. The diesel bus isn't exactly pollution free. W: True. They'll be running a lot cleaner soon. We were just talking about that in my environmental engineering class. M: What could the city do? Install pollution filters in all their buses? W: They could, but those filters make the engines work harder and really cut down on the fuel efficiency. Instead, they found a way to make their engines more efficient. M: How? W: Well, there is a new insulator. And you spray a thick coat of it on the engine. M: An insulator? W: Yeah. What it does is reflect back the heat of burning fuel. So the fuel will burn much hotter and burn up more completely. M: So a lot less unburned fuel comes out to pollute the air. W: And the bus will need less fuel. So with the saving on fuel cost, they say this will all pay for itself in just six months. Why does Diana take a bus that day? 男士问Diana为什么乘坐公共汽车，是不是她的汽车在维修。女士回答说不是，她乘坐公交车是因为最近她在考虑环境问题。大家都使用公共交通的话，空气会干净一些。可见她关注环境，故A正确。B未提及，C、D内容与对话不符。

【正确答案】 C

【答案解析】[听力原文] What is true about Diana? 女士说到：“在环境工程课上我们刚刚谈到过这一点。”可见她修了一门环境工程课，故C正确。四个选项都以Diana为主语，本题定然问她的情况。要根据选项关键词听对话，把涉及关键词的信息与选项对照，判断选项正误。

【正确答案】 A

【答案解析】[听力原文] What justifies the installation of a new insulator in the buses according to Diana? 对于安装新的绝热器，女士说：“它的作用在于它可以把燃料燃烧的热量反射回来，这样燃料燃烧时的温度就会更高，燃烧也就更彻底。”可见绝热器可以提高燃烧率，A正确。鉴于我们并不知道it指什么，听录音时，必须对有关事物予以重视。对话中，男士重复反问了一个词“An insulator?”表明它是对话中讨论的一个重点，问题it可能与它有关。紧接着女士的回答又用了“What it does is…”的强调结构，并用“So…”说明结果，相关内容即构成本题答案。

【正确答案】 D

【答案解析】[听力原文] What is the major concern of the woman? 对话中女士有车不开，宁愿挤公交车；上环境工程课；对节能环保绝热器感兴趣，均表明她关注环境，有浓厚的环保意识。因此，D正确。实际上本题是问对话主题，选项D概括性最强，是答案。其余选项均是细节，或与对话无关。