托福考试

根据网考网考试中心的统计分析，以下试题在2019/6/24日托福考试习题练习中，答错率较高，为：54%
【单选题】
A、(
A、new fuel for buses
B、The causes of air pollution
C、
A、way to improve fuel efficiency in buses
D、Careers in environmental engineering

网考网参考答案：C，答错率：54%
网考网试题解析：
[听力原文] 35-38 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 coniine 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 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 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 an 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. 35. What is the conversation mainly about document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>