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
Smog is something combined by smoke and fog. London is always known for its "black fogs". In the winter of 1952, a milky white f
Smog is something combined by smoke and fog. London is always known for its "black fogs". In the winter of 1952, a milky white f
admin
2010-01-07
80
问题
Smog is something combined by smoke and fog. London is always known for its "black fogs". In the winter of 1952, a milky white fog rolled into the city. It soon turned into black smog as the smoke of the city poured into the air. When it was over, more than 4,000 people had been killed by the thick black smog.
New York City has had several London type smog since 1950. Each time there were from 100 to 400 deaths caused by the smog.
In all the killer smog, factories and homes poured smoke and fumes into the air from the furnaces. The chemical fumes combined with the water-droplets in the fog to form harmful substances. These substances caused the illness of those who breathed the polluted air.
Usually, such harmful fumes rise into the upper air and are blown away by the wind. But sometimes, there is an unusual weather condition called a temperature inversion. A layer of cold air remains near the ground as smoke and fumes pour into it. This is covered by an upper layer of warm air that acts like a lid. It prevents the polluted cooler air rising. The harmful fumes piles up and make people iii. These fumes contain sulfur dioxide, soot particles, and other chemicals. The smog may be so thick that airports are closed and chains of collisions occur on the highways.
Another type of smog occurs in Los Angeles. Here the weather may be clear and sunny, but stinging eyes and dry coughs show that harmful chemicals fill the air. The smog is due to invisible gases, mostly from automobile exhausts. Because these chemicals are changed by the sun up in the air, Los Angeles smog is called Photochemical smog. It contains automobile exhaust fumes and nitrogen oxides changed by the sun’ s rays. Added to these are sulfur dioxide and other fumes from factories of oil refineries. Photochemical smog is found in many large cities all over the world.
Killer smog doesn’ t happen very often, fortunately. But in many large cities, a combination of automobiles exhaust fumes, home furnace smoke, and factory waste gases pours into the air. This may also happen in the suburbs in the country, where large factories have been built. A number of harmful substances have affected the health of the population.
All of the following together form smog Except ______ .
选项
A、smoke and fumes
B、snow
C、water drops
D、fog
答案
B
解析
属常识性问题,也可从文章开头得到提示。
转载请注明原文地址:https://kaotiyun.com/show/trPd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Accordingtothespeaker,whatareconveniencegoods?
Mostgrowingplantscontainmuchmorewaterthanallothermaterialscombined.C.R.Barneshassuggestedthatitisasproperto
AccordingtoMr.Tait,whatshouldwedotoimprovethesituationoftoothdecay?
WhendoesthefirsttrainoftheLondonUndergroundleave?
"Down-to-earth"meanssomeoneorsomethingthatishonest,realisticandeasytodealwith.Itisapleasureto(31)______some
Millionsofman-hoursarelosttoindustrythroughemployeessufferingbackacheorstraincausedbyoperatingpoorlydesignedma
In1959theaverageAmericanfamilypaid$989forayear’ssupplyoffood.In1972thefamilypaid$1,311.Thatwasaprice
IfyouarebuyingapropertyinFrance,whetherforapermanentoraholidayhome,itisimportanttoopenaFrenchbankaccount
Nomatterwhatyoursituationis,oneofthegreatestdangersnowisthatyou’llstopdoingwhatyou’realreadydoingright.66.
Wherewastheletterprobablyplacedmanyyearsago?
随机试题
有30个2克的砝码和8个5克的砝码,如果砝码只能放一边,那么从2克到100克间的整数克质量,有多少个不能用这些砝码称量出来?
肺痈成痈期的治法
连结“肺主呼吸”和“心主血脉”的中心环节是
张小姐,20岁,恶心、呕吐,上腹部疼痛数小时后转为右下腹痛,体温38℃,右下腹有固定压痛点,有腹肌紧张及反跳痛,白细胞15×109/L,首先考虑诊断是
在合同规定的时间内,未进行货物验收,或在检验后未在合同规定的时间内提出异议,即视为()。
适用于室内饰面层、建筑物门厅及建筑物外饰面层的建筑装饰玻璃是()。
笔墨纸砚文房清玩书写工具与材料“工欲善其事,必先利其器。”中国书法是中国特有的文化和艺术创造,笔、墨、纸、砚是创造中国书法特有的工具与材料,它们作为中国书法和中国绘画的基本工具,是伴随着中国科学技术的发展而发展的,体现了中国人的聪明和智慧。笔墨纸
一、注意事项1.申论考试,与传统作文考试不同,是对分析驾驭材料的能力与对表达能力并重的考试。2.作答参考时限:阅读资料40分钟,作答110分钟。3.仔细阅读给定的资料,按照后面提出的“申论要求”依次作答。二、给定资料材料一
执行以下程序段后,(BX)=( )。 MOV AX,0 MOV BX,1 MOV CX,100 A:ADD AX,BX INC BX LOO PA HLT
A、Filedpotatoes.B、Tomatojuice.C、Sweetcom.D、Chocolatebeans.D
最新回复
(
0
)