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
Acid rain is a very serious air and water pollution problem. Many people feel-that it is the most serious pollution problem that
Acid rain is a very serious air and water pollution problem. Many people feel-that it is the most serious pollution problem that
admin
2013-06-02
66
问题
Acid rain is a very serious air and water pollution problem. Many people feel-that it is the most serious pollution problem that we now face. Scientists say that plant and animal life in thousands of lakes in the United States and Canada has already been destroyed by acid rain.
Acid rain forms in the upper atmosphere. There, sulfur dioxide and nitrogen oxides mix with water vapor. They mix with water vapor to form sulfuric acid and nitric acid. When the vapor condenses and rain falls, the acids fall with it. Every time acid rain falls in a lake, the level of acid in the lake rises. Over time, it can rise to the point at which plants and insects cannot survive. Without plants, which supply oxygen, and insects, which supply food, fish die. The lake becomes a dead lake.
The problem of acid rain has greatly increased in the last few years. Most of the blame for acid rain has been placed on industries. However, some people feel that ineffective air pollution laws are also to blame for the acid rain problem.
A few years ago, many cities and states passed local air pollution laws. The laws were written to impr9ve the air quality in the cities and states. However, the laws usually didn’t say anything about the amount of pollution that an industry could pump into the air. Industries found a way to meet the new pollution laws without reducing the amount of pollution they released. They met the new standards by building taller smokestacks.
With the taller smokestacks, air pollutants were released higher up into the atmosphere. The wind carried them far away from the polluting factory. To the people near the factory, the air seemed cleaner. However, the pollution that they once got was now coming down hundreds of miles away in the form of acid rain.
Why do lakes in the United States and Canada become dead lakes?
选项
A、Fish in the lakes die because acid rain deprives them of oxygen.
B、Fish in the lakes die from taking in poisonous substances released from the acids.
C、Fish in the lakes die from direct contact with accumulated acid in the water.
D、Air pollutants are dissolved in the water and thus kill the fish.
答案
A
解析
文章第二段说明,因为酸雨破坏了水中的氧气,湖里的鱼无法生存。
转载请注明原文地址:https://kaotiyun.com/show/7iB7777K
0
大学英语六级
相关试题推荐
Largecompaniesneedawaytoreachthesavingsofthepublicatlarge.Thesameproblem,onasmaller【B1】_____,facespractica
Formanypeopletoday,readingisnolongerrelaxation.Tokeepuptheirworktheymustreadletters,reports,tradepublication
A、Itcombinesdifferentfeelingstogether.B、Itcanexpresssomeveryconfusingfeelings.C、Itexaggeratessomespecialfeelings
Whydoestheauthorusethephrase"fornextNovember"(Line3,Para.1)?Theauthor’stoneinthearticlecanbedescribedas
Whydoestheauthorusethephrase"fornextNovember"(Line3,Para.1)?Onewayfortheregiontousewaterefficientlyisto
Whichofthefollowingisthebesttitleforthepassage?WhydidtheAfricannationswelcomeanivoryban?
A、Theinternationalinsuranceinherhomecountry.B、Thestudenthealthinsurance.C、Bothoftheinternationalinsuranceandthe
Themainpurposeoftheauthoristointroducetostudentshowtohaveaneffectivestudy.Tograde-grubbers,theyhavemorefe
Themainpurposeoftheauthoristointroducetostudentshowtohaveaneffectivestudy.Socialstudierslearnbetterby____
Thereasonsbehindthelackofphysicalactivityinvariousnations______(除了汽车和电视的普及外,还包括都市化).
随机试题
心位于()
影响健康行为的因素是
一下关于M乙酰胆碱受体拮抗剂的叙述哪些是正确的
重度哮喘时,除吸氧外还应采取哪些措施
A.减少肠道内氨的形成和吸收B.恢复正氮平衡C.降低门静脉压力D.纠正电解质紊乱E.纠正酸碱平衡紊乱肝性脑病注射支链氨基酸的主要作用是()
关于现代宪法的发展趋势,下列哪些说法是正确的?(2010年卷一60题)
下列属于证券交易隐性成本的是()。
一旦CA验证了实体的身份,就产生一个证书,将这个公共密钥和身份进行绑定。证书中包括公共密钥和密钥所有者的全球惟一的_____________。
Whereisthereportprobablybeingbroadcasted?
A、TomakefulluseofthemetalsleftB、Toprotecttheforestresourcesfrombeingdestroyed.C、Tocallforstoppingusingplast
最新回复
(
0
)