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
In the Black Forest, the acid rain is said to attack all EXCEPT
In the Black Forest, the acid rain is said to attack all EXCEPT
admin
2014-06-02
58
问题
In the Black Forest, the acid rain is said to attack all EXCEPT
Good morning, everyone. Today we’re going to talk about acid rain. You may wonder what is acid rain. Well, it is almost impossible to describe the mathematical relationship between what goes up as pollutant emissions and what comes down as acid rain. But we do know the primary source of acid rain is the power station smoke stack. The pollutants combine with moisture in the atmosphere and they fall as an acid mixture causing the rain. Do you know what the Germans call this acid rain? They call it royal water, because it can even break down gold.
The royal water, I mean the acid rain, falls in rain or snow on the romantic Black Forest, and attacks the soil. Microorganisms within the soil collapse and metals harmful to trees like aluminum are leaked out. At the same time, the acid rain attacks the 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 are dying. The first symptoms of death by pollution in a fir is the yellowing of the needles. At the back of the fir needle you can see the pores through which the plants breathe. The acid rain destroys those pores, and prevent them from closing. So on a warm day, the plant loses all of its moisture through all those open pores. The needles, as a result, turn yellow and die.
The statistics that are available now are horrifying. Of these trees in the Black Forest, 41% of all spruce are diseased, 43% of all pine are diseased, 26% of beach trees, 76% of all fir trees and 16% of all others are dying. Environmental groups like Green Peace Campaign around Europe are trying to stop the acid rain.
Germany is now leading the way in attacking part of the problem. Motor vehicles are thought to contribute significantly to the pollution of the atmosphere. ’The by-products of motor vehicle emissions are considered dangerous to plants and humans as well. 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 catalytic converter. Use of the converter requires people to switch to lead-free petrol. This might explain why the Europeans are reluctant tofollow Germany’s lead in cleaning up its motor vehicle emission. It’s unlikely that Germany will force her European neighbors to change to lead-free petrol. The reason is that though her neighbors may be slow in cleaning up their smoke stacks, they will have to comply with the new motor vehicle requirements, if they want the wealthy German tourists driving across their borders. Certainly, the menace of acid rain knows no borders because it gathers in the rain clouds and goes with the prevailing winds. So Canada’s lakes die from America’s pollution. Germany’s trees die from her next-door neighbors. Sweden’s lakes fall victim to Britain’s industry. And there are many similar examples. And I won’t go into them because of time constraint. 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. But throughout the northern hemisphere it’s agreed that such measures, though important, will be of minimal effect. If we are to save what’s left of the forests and lakes in the world, a strict international emission standard must be uniformly imposed on industry. However, it’s unlikely that will be agreed before many more hectares of precious forests are destroyed.
选项
A、new car designing schemes.
B、new car production lines.
C、a new type of smoke stacks.
D、new car safety standards.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/CkpO777K
0
专业英语八级
相关试题推荐
WheredomostofFrenchCanadiansliveinCanada?
HowtoPresentaSeminarPaperToinvolvetheirstudentsmoreactivelyinthelearningprocess,manyuniversityteachersusu
AccordingtoJaneMbugua,whendidtheattackoccur?
OnthedayaftertheJapaneseattackonPearlHarbor,RepresentativeCharlesA.Eaton,RepublicanofNewJersey,madehiscasei
______isconsideredbymanycriticstobeoneoftheearlygreatworksofEnglishliteraturealongwithChaucer’sTheCanterbury
中国有句古话是这样的:“山不在高,有仙则名;水不在深,有龙则灵。”中国书法好似山上之仙、水中之龙。中国书法同其他书写形式有很大区别。汉字在其漫长的发展史中演化成许多不同的艺术形式,其中包括甲骨铭文、青铜器铭文、篆书、隶书、楷书、行书和草书。
ScientistsinCaliforniaandVirginiawilltrytodecodegeneticmakeupoftwoplant-destroyingmicrobes,including【M1】______o
Hemingwayisa______accordingtoGertrudeStein.
HowtoUsetheLibraryThebooksinalibrarycanbeclassifiedundertwomain【1】—fictionandnonfiction.Whendoingresearch
随机试题
下列不是胃食管反流病诱发因素的是
技术开发合同的成果归属原则是,有约定的按约定,没有约定的应归属于______。
昌祥食品厂有两位车间主任,上班提前到岗,下班后工人都走了,他们还逐一熄灯、关门,起早贪黑,活没少干,但任职的管理工作却不够理想。厂长王守业将他们免职,有人提出异议,王厂长却说:“这样的同志可以当组长、工长,甚至劳动模范,却不能当称职的车间主任。”这说明(
预防阵发性夜间呼吸困难发作,最主要的护理措施是
下列合同中,属于可撤销合同的有()。
注册会计师在审计甲股份有限公司2011年度财务报表时,知悉该公司可能存在重大舞弊行为,则应采取的措施是()。
设y=f(x)由cos(xy)+lny-x=1确定,则=().
RecentsurveysshowthatJapaneseyouthhavebecomea"MeGeneration"thatrejectstraditionalvalues."Around1980manyJap
Abodyweighs______fromthesurfaceoftheearth.
A、5:20B、5:00C、5.35D、5:45CW:Whattimedidthefilmstartyesterday?M:Itwassupposedtostartataquarterpast5,butit
最新回复
(
0
)