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英语六级新题型长篇阅读练习2017年英语六级新题型长篇阅读练习Jackofalltradesandmasterofnone.以下是小编为大家搜索整理的2017年英语六级新题型长篇阅读练习，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!Words:1,103HowOzonePollutionWorksA)TheweatherreportontheradioorTVtellsyouthatitisgoingtobesunnyandhotandthatanorangeozonealerthasbeenissued.Whatisozone?Whatdoesanorangealertmean?Whyshouldyoubeconcernedaboutit?Inthisarticle,wewillexaminewhatozoneis,howitisproduced,whathealthhazardsitposesandwhatyoucandotoreduceozonepollution.B)Ozoneisamoleculeofthreeoxygenatomsboundtogether(O3).Itisunstableandhighlyreactive.Ozoneisusedasableach,adeodorizingagent,andasterilizationagentforairanddrinkingwater.Atlowconcentrations,itistoxic.Ozoneisfoundnaturallyinsmallconcentrationsinthestratosphere,alayerofEarth’supperatmosphere.Inthisupperatmosphere,ozoneismadewhenultravioletlightfromthesunsplitsanoxygenmolecule(O2),formingtwosingleoxygenatoms.Ifafreedatomcollideswithanoxygenmolecule,itbecomesozone.Stratosphericozonehasbeencalled“good”ozonebecauseitprotectstheEarth’ssurfacefromdangerousultravioletlight.C)Ozonecanalsobefoundinthetroposphere,thelowestlayeroftheatmosphere.Troposphericozone(oftentermed“bad”ozone)isman-made,aresultofairpollutionfrominternalcombustionenginesandpowerplants.Automobileexhaustandindustrialemissionsreleaseafamilyofnitrogenoxidegases(NOx)andvolatileorganiccompounds(VOC),by-productsofburninggasolineandcoal.NOxandVOCcombinechemicallywithoxygentoformozoneduringsunny,high-temperatureconditionsoflatespring,summerandearlyfall.Highlevelsofozoneareusuallyformedintheheatoftheafternoonandearlyevening,dissipatingduringthecoolernights.D)Althoughozonepollutionisformedmainlyinurbanandsuburbanareas,itendsupinruralareasaswell,carriedbyprevailingwindsorresultingfromcarsandtrucksthattravelintoruralareas.Significantlevelsofozonepollutioncanbedetectedinruralareasasfaras250milesdownwindfromurbanindustrialzones.E)Youcanmakeozoneteststripstodetectandmonitorozonelevelsinyourownbackyardoraroundyourschool.Youwillneedcorn
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