首页
登录
职称英语
In the Black Forest, the acid rain is said to attack all EXCEPT [br] [originalt
In the Black Forest, the acid rain is said to attack all EXCEPT [br] [originalt
游客
2023-12-08
12
管理
问题
In the Black Forest, the acid rain is said to attack all EXCEPT [br]
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://tihaiku.com/zcyy/3256294.html
相关试题推荐
WhatdoesFrankhavetodonext?[br][originaltext]Theresa(W)Frank(M)W:Ho
WhatdoesFrankhavetodonext?[br][originaltext]Theresa(W)Frank(M)W:Ho
WhatdoesFrankhavetodonext?[br][originaltext]Theresa(W)Frank(M)W:Ho
WhatdoesFrankhavetodonext?[originaltext]Theresa(W)Frank(M)W:Howisy
[originaltext]InterviewwithNickUlaruAboutleadershipandteambuil
[originaltext]InterviewwithNickUlaruAboutleadershipandteambuil
AllofthefollowingareborrowingsinEnglishEXCEPT______.A、kung-fuB、judoC、
[originaltext]MalaysianPresidentAbdullahBadawisaystheMuslimworldshoul
[originaltext]Woman:Well,itseemsquitecommonactually.LotsofpeopleinAu
[originaltext]Woman:Well,itseemsquitecommonactually.LotsofpeopleinAu
随机试题
Thephrase"men’ssurenessoftheirsexrole"inthefirstparagraphsuggestst
Whenaconsumerfindsthathispurchasehasafaultinit,whatisthefirstthi
Theterm"qualityoflife"isdifficulttodefine.It【C1】______averywides
附着升降脚手架的每一作业层架体外侧不必设置上、下两道防护栏杆和挡脚板。()
对于n个元素的关键字序列{ki,k2,…,kn},当且仅当满足关系ki≤k2i且
提高多普勒检测灵敏度的方法,不可取的是A.降低发射超声波的基础频率 B.使接收
国际债券同国内债券相比具有一定的特殊性,主要表现在( )。 Ⅰ.资金来源广,
关于限定日剂量(DDD)说法不正确的是A.DDD通常用来评价药物的使用情况 B
关于葡萄胎的病理特点,正确的是A.滋养细胞侵犯肌层 B.无胎儿及其附属物 C
前期牙本质是A.在成牙本质细胞和矿化牙本质之间是一层未钙化的牙本质 B.牙本质
最新回复
(
0
)