首页
登录
职称英语
Air Pollution Air pollution is typically cau
Air Pollution Air pollution is typically cau
游客
2023-12-12
39
管理
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. [br] 【6】
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
lungs
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3267722.html
相关试题推荐
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Airpollutionexistsnotonlyoutdoor,butalsoindoor.Ithasgreateffectso
Kidnappingsaroundtheworldhavetypicallyhadoneoftwomajorgoals:publi
Kidnappingsaroundtheworldhavetypicallyhadoneoftwomajorgoals:publi
Kidnappingsaroundtheworldhavetypicallyhadoneoftwomajorgoals:publi
随机试题
Atsometimeinyourlife,youmayhaveastrongdesiretodosomethingstra
没有人知道中国的汽车市场最终会有多大。中国2014年汽车销售量达到2349万辆,远远超过了美国,创下了新的纪录。但如果日益严重的交通堵塞超过了中国正在
某工程单代号网络计划如下图所示(时间单位:天),下列说法错误的是( )。 A
采用均衡价格理论制定运价是将定以()为前提的。A.均衡运输 B.合理运输
商品房买卖当事人以约定的违约金低于造成的损失为由请求增加的,应当以()确定违
关于药物通过生物膜转运的特点的正确表述是A.被动扩散的物质可由高浓度区向低浓度区
1995-75.心为 A.生之本B.气之本C.罢极之本D.封藏之本E
法律原则可分为公理性原则和政策性原则,下列属于政策性的原则是( )。 A.诚
2012年1月,中国甲市公民李虹(女)与美国留学生琼斯(男)在中国甲市登记结婚,
雌激素类药和孕激素类药均可用于()A.晚期乳腺癌 B.绝经期综合征 C
最新回复
(
0
)