A、A new fuel for buses. B、The causes of air pollution. C、Careers in environmental engineering. D、A way to improve fuel efficienc

admin2010-01-10  47

问题  
M: Hi, Diana. Mind if I sit down?
W: Not at all, Jack. How have you been?
M: Good. But 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 transportation when we could.
M: I’m sure you are right. The diesel bus isn’t exactly pollution free.
W: True. But they’ll be running a lot cleaner soon. We were just talking about that in my environmental engineering class.
M: What’s the city gonna do? Install pollution filters of some sort on their buses?
W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. Instead they found a way to make their engines more efficient.
M: How?
W: Well, there is a material called coniine oxide. It’s a really good insulator. And a thick coat of it get sprayed on certain part of the engine.
M: An insulator?
W: Well, yeah. Actually, 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, right?
W: Yeah, and the bus will need less fuel. So with the savings on fuel oil costs, they say this will all pay for itself in just six months.
M: Sounds like people should all go out and get some of this stuff to spray on their car engines.
W: Well, it’s not really that easy. You see, normally, the materials are fine powder. To melt it so you can spray a coat of it on the engine parts, you first have to heat it over 10,000 degrees and then, well, you get the idea. It’s not something you or I would be able to do ourselves.

选项 A、A new fuel for buses.
B、The causes of air pollution.
C、Careers in environmental engineering.
D、A way to improve fuel efficiency in buses.

答案D

解析 What is the conversation mainly about?
从听力对话中我们可知女士向男士介绍一种能使发动机运转更有效率的方法(a way to make their engines more efficient)。听力材料中前半部分提到的女士选择坐公共汽车以及环境污染问题实际都是在为本文介绍coniine oxide这种提高发动机效率的方法作铺垫。
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