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[originaltext]M: Hi Diana, mind if I sit down?W: Not at all, Jerry. How have y
[originaltext]M: Hi Diana, mind if I sit down?W: Not at all, Jerry. How have y
游客
2023-09-01
57
管理
问题
M: Hi Diana, mind if I sit down?
W: Not at all, Jerry. 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 the confine oxide. It’s a really good insulator. And a thick coat of it get sprayed on the certain part of the engine.
M: An insulator?
W: Well, yeah. Actually, what it does is to 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 tile air, right?
W: Yeah, and the bus will need less fuel. So with the savings on fuel cost, they say this will all pay for itself in just six months.
M: Sounds like people should all go out and get some this stuff to spray 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 be able 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
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