首页
登录
职称英语
My topic today is "The Car and Air pollution. " In particular, I want firstl
My topic today is "The Car and Air pollution. " In particular, I want firstl
游客
2025-04-14
21
管理
问题
My topic today is "The Car and Air pollution. " In particular, I want firstly to discuss the ways in which the car causes air pollution; and secondly, how we can control or reduce air pollution from the car.
First, then, how does the car cause air pollution? 【T1】
What happens is that the car’s internal combustion engine is a kind of chemical factory on a small scale.
It uses a mixture of petrol and air, and this mixture explodes and burns, to produce the energy which propels the car. 【T2】
But while this is happening, many complicated chemical reactions are taking place.
In particular, part of the petrol-air mixture is not completely burned up, and so the exhaust gasses from the engine contain some very dangerous chemicals, such as carbon monoxide, nitrogen oxides, lead and hydrocarbons.
This is the situation, then, and it’s going to get much worse, unless we do something about it. So, let’s focus our attention now on ways of controlling or reducing the amount of air pollution caused by the car.
First, we can discourage the use of cars. For example, we can put higher taxes on petrol and on cars themselves-especially the larger ones that use a lot of petrol.
【T3】
Second, we can encourage alternative methods of transport both between and within urban areas. For instance, we can make train and bus services cheaper and more convenient. And we can build a mass transit system in large cities, particularly an underground railway system such as those in London, New York, Moscow and Tokyo.
Next, we can use a different and cleaner fuel for the internal combustion engine with other designs.
Fourth, we can replace the present internal combustion engine with other designs. There are several possibilities being researched at present, such as electric, gas turbine, and "steam" engines. However, each of these engine designs has its own disadvantages.
【T4】
Last but not the least, we are trying to control the emissions from the internal combustion engine much more strictly. This, for example, is a catalytic converter, which converts the most dangerous ingredients of the car exhaust into water and harmless gases.
As I’m sure you can see, there are problems with each of these ways; but at least they’re a step in the right direction. Probable the best answer is a synthesis of all five. [br] 【T1】
选项
答案
汽车造成的空气污染是因为汽车的内燃机实际上是一座小型“化工厂”。汽车内燃机所用的燃料是汽油加空气的混合物。汽油混合着空气,燃爆后产生驱车动力。
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4037183.html
相关试题推荐
An______testisaroughmeasureofachild’scapacityforlearning,particularly
Alwaysatthebeginningofanyparticularhunttherewasonesolemnceremony
Alwaysatthebeginningofanyparticularhunttherewasonesolemnceremony
Pupilsoftenwanttositnexttotheirparticularfriendandmanyclassroomacti
ThegeologyoftheEarth’ssurfaceisdominatedbytheparticularproperties
ThegeologyoftheEarth’ssurfaceisdominatedbytheparticularproperties
Inthe______ofrecentincidents,weaskourcustomerstotakeparticularcareof
Wehaveknownforalongtimethattheorganizationofanyparticularsociet
Wehaveknownforalongtimethattheorganizationofanyparticularsociet
A(n)______testisaroughmeasureofachild’scapacityforlearning,particular
随机试题
Onedayalittleboycomesintoashopand【C1】______theshopassistant,“Iwa
PassageThree[br]Whatdoes"disappearingundertheradar"probablymeaninPar
[originaltext]Aristotle,theGreekphilosopher,summedupthefourchiefqu
111一男孩,12岁,患1型糖尿病,近日因肺部感染诱发酮症酸中毒。特征性的症状是
小承气汤与厚朴三物汤之间的变化属于A.药量增减的变化 B.药味加减的变化 C
A.传染性软疣 B.湿疹 C.带状疱疹 D.单纯疱疹 E.脓疱疮黄水疮相
焦山楂A.善于消食化积 B.长于消食止泻 C.具有止血、止泻的功效 D.善
新设备或大修后组合电器投入运行72小时内应开展不少于3次特巡,重点检查设备有无异
北美洲与南美洲的分界线是( )。A.巴西高原 B.白令海峡 C.巴拿马运河
ECC合同,下列属于工程施工合同文本的核心条款的是( )。A.发包商的主要责任
最新回复
(
0
)