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 Air pollution is typically caused by【1】_____ran by the factories of modern industrial na-
Air Pollution Air pollution is typically caused by【1】_____ran by the factories of modern industrial na-
admin
2012-12-30
43
问题
Air Pollution
Air pollution is typically caused by【1】_____ran by
the factories of modern industrial na- 【1】_____
tions, automobiles, trains, planes, and buses. Each year, plenty of wastes get into the air.
It does great harm to people,
【2】_____the eyes and chests. Many people become ill, and the 【2】_____
death raw among elderly people and people with lung disorders climbs rapidly caused by a weather 【3】 【3】_____
_____called a temperature【4】_____. 【4】_____
At least half of the pollutants in the air come from the engines of motor vehicles. As they burn
fuel, they give off carbon monoxide as a waste, a colorless, odorless gas, and a deadly poison. Thisproblem can be solved by special devices designed to
make the engine burn the fuel more【5】_____. 【5】_____
Some manufacturers use electricity or other means that will reduce pollution.
Coal and oil are also an important resource of waste.
It is irritating to the【6】_____. Sonic 【6】_____
cities have passed laws that allow coal and oil to be burned only if their sulfur content is low. Thereis no air pollution of the ordinary kind. But the【7】_____materials in these plants could present a 【7】_____
danger in an accident. Also, there is a problem in disposing of the radioactive wastes in a way that will not endanger the environment.
Another type of pollution, called heat pollution,
is caused by both the fuel-burning and【8】 【8】_____
_____plants. It may also kill fish and their eggs, or【9】_____with their growth. 【9】_____
Totally, physicists,
many power plants and【10】_____should work together to study new 【10】____
ways of generating electricity.
【1】
Air Pollution
A great deal of energy is needed to run the factories of modern industrial nations. Automobiles, trains, planes, and buses need energy, too. Nearly all of this energy is produced in the same way—by burning fuels. The burning produces wastes. Some of the wastes get into the air, causing air pollution.
Government officials in the United States estimate that 200, 000, 000 tons of these wastes enter the air each year—1 ton for each person in the country!
A curtain of smog often hangs over big cities. It irritates the eyes and chests. The word "smog" is a combination of the words "smoke" and "fog", but "smog" itself is a mixture of many more ingredients. It begins with some of the pollution from burning: carbon monoxide, and oxides of nitrogen and sulfur are among them. Some of the pollutants react with one another to form new irritating substances. Energy is needed for the reactions, and it is supplied by the light of the sun. The resulting mixture is photochemical smog. ("Photo" means light.) It can be deadly.
In London, Tokyo, New York, and other cities, a weather condition called a temperature inversion allows smog to hang over the city for several days at a time. Many people become ill, and the death rate among elderly people and people with lung disorders climbs rapidly.
At least half of the pollutants in the air come from the engines of motor vehicles. As they burn fuel, they give off carbon monoxide as a waste. Carbon monoxide is a colorless, odorless gas, and a deadly poison. The amount of carbon monoxide that an engine gives off can be reduced by special devices designed to make the engine burn the fuel more efficienfiy.
Automobile manufacturers are working on experimental cars run by electricity or other means that will reduce pollution. City governments in various parts of the world have begun to close certain streets to automobile traffic, hoping to lower pollution levels. Many city planners believe that cities, or at least their central areas should be kept free of automobiles.
Motor vehicles are not the only air polluters. Coal and oil, used to heat homes and factories and to generate electricity, contain small amounts of sulfur. When the fuels are burned, sulfur dioxide, a poisonous gas, is produced. It is irritating to the lungs. Sonic cities have passed laws that allow coal and oil to be burned only if their sulfur content is low.
Most electricity is generated by steam turbines. About half of the sulfur ,dioxide in the air comes from burning fuel to make steam. Nuclear power plants do not burn fuel, so there is no air pollution of the ordinary kind. But the radioactive materials in these plants could present a danger in an accident. Also, there is a problem in disposing of the radioactive wastes in a way that will not endanger the environment.
Another type of pollution, called thermal (heat) pollution, is caused by both the fuel-burning and nuclear plants. Both need huge amounts of cold waters which is warmed as it cools the steam. When it is returned to the river, the warm water may stimulate the growth of weeds. It may also kill fish and their eggs, or interfere with their growth.
Physicists are studying new ways of generating electricity that may be tess damaging to the environmeni. In the meantime, many power plants are being modernized to give off less polluting material. Also, engineers try to design and locate new power plants to do minimum damage to the environment.
选项
答案
energy
解析
转载请注明原文地址:https://kaotiyun.com/show/hVaO777K
0
专业英语八级
相关试题推荐
Iknownowthatthemanwhosatwithmeontheoldwoodenstairsthathotsummernightoverthirty-fiveyearsagowasnotatall
IntheUnitedStates,charterschoolsprovidealternativesto"regular"publicschools.Unlikemostpublicschools,chartersdon
IntheUnitedStates,charterschoolsprovidealternativesto"regular"publicschools.Unlikemostpublicschools,chartersdon
TheAmericanFamilyWe’lllearntheAmericanfamiliesfromthefollowingfiveaspects:1.Familystructures1)Immediatefamily
Theconcernthroughouttheworldin1968forthosethreewhalesthatwerelockedintheArcticicewasdramaticproofthatwhale
Linguistshavefoundthatsignlanguagesandspokenlanguagessharemanyfeatures.Likespokenlanguages,whichuseunitsofsou
I.CausesofBreakdownsin(1)【1】______1.Onstudents’part—insufficientcommandoverthe(2)ofEnglish【2】______—p
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectsonpeople,andtherearemanymeasurestakentocor
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectsonpeople,andtherearemanymeasurestakentocor
AbreakthroughintheprovisionofenergyfromthesunfortheEuropeanEconomicCommunity(EEC)couldbebroughtforwardbyup
随机试题
肠阿米巴病变可累及
POMR记录方式的优点不包括
增进食欲的药物应( )。对胃有刺激性的药物应( )。
Receivedforshipmentbilloflading,statesdefinitelythatthegoodshavebeenreceivedbythecarrierandconfirmsthatthego
上海期货交易所铝和天然橡胶期货合约的交割月份规定是一样的。()[2012年5月真题]
根据所给材料回答问题。(需计算后回答的问题须列出算式;每个问题计算过程中的小数均保留实际位数,计算结果有小数的,小数保留2位。)某高校工程制图教研室张老师、赵老师在多年教学实践的基础上,编写了《建筑制图》一书,张老师还安排研究生李娟制作了其中部分
对于节俭,从业人员应该树立的正确认识有()。
在态度型培训法中,行为模仿法不适宜于()的培训。[2014年11月三级真题]
化学真正被确立为一门科学,是从()时开始。
鸽子是这城市的精灵。______它们眼里,收进了多少秘密呢?填入横线处最恰当的是( )。
最新回复
(
0
)