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
75
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.
【7】
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
radioactive
解析
转载请注明原文地址:https://kaotiyun.com/show/6VaO777K
0
专业英语八级
相关试题推荐
IntheUnitedStates,charterschoolsprovidealternativesto"regular"publicschools.Unlikemostpublicschools,chartersdon
TheAmericanFamilyWe’lllearntheAmericanfamiliesfromthefollowingfiveaspects:1.Familystructures1)Immediatefamily
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughtsarecausingfamin
Theconcernthroughouttheworldin1968forthosethreewhalesthatwerelockedintheArcticicewasdramaticproofthatwhale
IntheUnitedStates,thereissomedisagreement(tosaytheleast)overtherisksandbenefits.ofnuclearpower.Therecanbe
Beguninthelate1960sbyPentagonweaponsresearchersasasystemforeasingcommunicationbetweencomputersindisparateelec
Beguninthelate1960sbyPentagonweaponsresearchersasasystemforeasingcommunicationbetweencomputersindisparateelec
AbreakthroughintheprovisionofenergyfromthesunfortheEuropeanEconomicCommunity(EEC)couldbebroughtforwardbyup
AbreakthroughintheprovisionofenergyfromthesunfortheEuropeanEconomicCommunity(EEC)couldbebroughtforwardbyup
______wasproclaimedCanada’snationalanthemonJuly1,1980.
随机试题
Studentswithfinancialproblemsaretroubledbyhightuition________.
治疗面痛风寒证可加配穴为
不与胃后壁毗邻的结构是
患者,女性,68岁。因颅内压增高,头痛逐渐加重,行腰椎穿刺脑脊液检查后突然呼吸停止,双侧瞳孔直径2mm,以后逐渐散大,血压下降。该患者最可能出现了
吸收到人体内的葡萄糖、氨基酸和脂类物质所不共有的代谢过程是()。
在识别项目范围之后,项目范围管理的下一步任务是________。
班杜拉提出的观察学习的过程包括()。(济南市)
给定资料1.2011年,H省Z县“天价接待费”新闻引发社会强烈关注。有媒体曝光H省委第六巡视组在Z县巡视20余天,花费高达80余万元。Z县委办在接受该媒体采访时称,省委巡视组一行8人,4月12日进驻,5月9日离开,其间总开支为114490元。此前
阅读以下关于实时操作系统设计方面的叙述,回答问题1和问题2。某大型化工生产集团公司原有的产品监测系统采用的是集中式系统,由位于集团公司总部的监测中心的主机集中处理来自于各监测点采样到的产品资料。随着该公司规模的扩大与产品监测工作要求的深化,集团公司
Readthearticlebelowaboutacompanythatsellshouseholdproducts.ChoosethebestwordtofilleachgapfromA,B,Cor
最新回复
(
0
)