首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Air Pollution and Acid Rain The increasing variety and prevalence of pollution presents the world with many extremely daunti
Air Pollution and Acid Rain The increasing variety and prevalence of pollution presents the world with many extremely daunti
admin
2013-04-25
49
问题
Air Pollution and Acid Rain
The increasing variety and prevalence of pollution presents the world with many extremely
daunting
problems, air pollution in particular ranks among the most serious. In the following text, air pollution and acid rain caused by automobiles will be discussed. Certain solutions to the problem will be provided in the conclusion.
It is widely known that cars are the main cause of air pollution in cities, accounting for 60% to 90% of all air pollution. This will get worse as the number of cars increases in urban areas. How do cars cause air pollution? First we must examine how a car works. There’s a mixture of petrol in the car’s internal combustion engine which create the force for the automobile to move. Unfortunately, in this process there are some poisonous chemicals which remain; these poisonous chemicals mainly come out of the car through the
exhaust
, it’s not just what comes out of the car exhaust that is dangerous, the brake system also causes pollution. Brakes on cars release asbestos, it is a highly dangerous substance and it can kill humans. Also, the tires themselves give off small rubber particles which are not very healthy.
Acid rain caused by air pollution has strongly influenced people’s lives. It is almost impossible to describe the mathematical relationship between what goes up as pollutant emissions and what comes down as acid rain. However, we do know the primary source of acid rain is the pollution released by power plants. The pollutants combine with moisture in the atmosphere and then fall as an acid rain. Germans often call it royal water, because it can break down gold.
The royal water falls in the form of rain or snow on the German Black Forest and attacks the soil. Microorganisms within the soil perish and metals harmful to trees like aluminum leak into the ground. At the same time, the acid rain attacks the trees’ leaves and
dissolves
their waxy coating. The leaves then shrivel and die. About one in every ten trees in the Black Forest is a fir. 76% of all firs in the Black Forest are dying. 41% of all spruce are diseased, 43% of all pine are diseased, 26% of beech trees and 16% of all other trees are dying. Environmental groups like Green Peace campaign around Europe trying to stop the causes of acid rain.
We need to find solutions to this problem. First, we should try and discourage the overuse of cars. We could do this by raising taxes on petrol or by making cars more expensive.
Second, we can encourage alternative methods of transportation. For example, in Shanghai recently, a subway has been built underground, which takes some of the pressure off the roads. Some people would rather use the underground than drive their cars. Next, we could develop and use cleaner fuels instead of petrol. For example, we might use natural gas in the future or we might experiment with battery powered cars.
Finally, the actual by-products of vehicle emissions must be managed.
(A)Scientists and engineers are now trying to use mechanical means for reducing the amount of chemicals that are emitted from cars’ exhaust pipes.
(B)Germany is now leading the way in attacking this part of the problem.
(C)In order to clean up motor vehicle emissions, all new cars in Germany must now meet new emission standards and be fitted with a device called a catalytic converter.
(D)This is a device that is fixed over the exhaust and controls the carbon monoxide and other dangerous chemicals that cars give off. Like Germany, the United States also introduced strict clean air-controls on motor vehicle emissions in the mid-70s as part of their efforts to reduce acid rain. It’s unlikely that any one of these solutions will work on its own. It will take a combination of all four of these solutions to help solve the air pollution problem.
The word exhaust in Paragraph 2 is closest in meaning to ______.
选项
A、fatigue
B、outlet
C、waste gases
D、extension
答案
B
解析
本题为词汇题,主要考查考生根据上下文对单词exhaust的理解。该词的所在句是:“these poisonous chemicals mainly come out of the car through the exhaust.”从这个语境来看,exhaust应该是“排气口,排气装置”的意思,正确答案应为选项B(出口),而选项A(疲乏,疲劳)、C(废气)、D(延长,扩充)都不符合题意。
转载请注明原文地址:https://kaotiyun.com/show/JayO777K
0
托福(TOEFL)
相关试题推荐
Whichcourseisthisonebasedon?【36】
Whichcolumnofthebarchartrepresentsthefiguresquoted?Bedrestisadvised______.
Theprofessorwantsthestudentstopretendthattheyare______.
Completetheformbelow.WriteONEWORDAND/ORANUMBERforeachanswer.TAUBERINSURANCECo.Policy#:
WritetheappropriatelettersA-Cagainstquestions26~30.Accordingtothespeakers,inwhichsituationarethefollowingm
Completetheformbelow.WriteNOMORETHANTHREEWORDSAND/ORANUMBERforeachanswer.Reportonabandoned
Carsblockingpathscouldpreventaccessby__________inanemergency.
A、Whystarsmovesoquickly.B、Whyfewstarshaveplanets.C、Whystarsaren’tmovingtowardoneanother.D、Whystarshaven’tmov
AMessengerfromthePastHispeoplesaidgood-byeandwatchedhimwalkofftowardthemountains.Theyhadlittlereasonto
Yourschoolhasreceivedagiftofmoney.Whatdoyouthinkisthebestwayforyourschooltospendthismoney?Usespecificre
随机试题
论述影响有效沟通的障碍及如何实现有效沟通。
A.苍术B.厚朴C.白豆蔻D.木瓜E.砂仁具有燥湿行气功效的药物是
患者,男性,56岁。吸烟30余年,20支/日,无诱因咳嗽,痰带血丝,间有低热,胸痛1个月。胸片示:左下叶高密度阴影,边界欠光滑,内有偏心空洞,痰结核菌涂片阴性。不应采用的治疗方案是
双侧肺满布湿啰音见于
按照支出用途分类,我国的财政支出共有()项。
根据资料,回答问题。假设某商业银行的业务如下:①各项存款2200万元;②各项贷款:1400万元;③库存现金100万元;④向央行办理票据再贴现100万元;⑤开办信托投资业务150万元;⑥发
①心理学领域有个术语叫做“羊群效应”,专门来形容人类的从众心理,羊群有个习性,就是跟着羊头走,无论前面的沟有多宽,只要羊头事先跳过去,后面的羊便会跟着往前跳。羊群效应一直是心理学研究的热点之一,社交网站的出现提供了一个绝佳的实验场,研究者可以通过大数据的研
甲、乙两种茶叶,以x:y(重量比)相混合制成一种混合茶,甲种茶叶的价格为每公斤50元,乙种茶叶的价格为每公斤40元,现在甲种茶叶的价格上调了10%,乙种茶叶的价格下调了10%,但混合茶的价格不变,则x:y等于()。
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchnarrowerlimitsmarktheboundariesofeffectivefunc
Thechildhidbehindhismother’sskirt,______hewasafraidofthedog.
最新回复
(
0
)