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外语
A、A fuel that burns cleanly. B、An oil additive that helps cool engines. C、A material from which filters are made. D、An insulatin
A、A fuel that burns cleanly. B、An oil additive that helps cool engines. C、A material from which filters are made. D、An insulatin
admin
2010-10-14
51
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. In stead 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 a ble to do ourselves.
选项
A、A fuel that burns cleanly.
B、An oil additive that helps cool engines.
C、A material from which filters are made.
D、An insulating material sprayed on engine parts.
答案
D
解析
细节题。在听力对话中出现一个专业名词时,通常情况下紧接着会对这一名词进行近一步的解释。听力材料中后文对coniine oxide作了解释It’s a really good insulator.And a thick coat of it get sprayed on the certain part of the engine.“是一种很好的绝缘体,并且喷洒在发动机某一部位的厚厚的涂层。”选项D将这一解释进行了归纳概括。
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0
大学英语四级
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