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第PAGE\*MERGEFORMAT10页共NUMPAGES\*MERGEFORMAT10页 2021年6月英语六级长篇阅读模拟练习附答案解析(2) 长篇阅读不似以往的快速阅读，而是改为段落信息匹配题了，下面是一篇长篇阅读模拟题，希望大家能练习一下积累做题经验。HowOzonePollutionWorksA)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.Youwillneedcornstarch,filterpaper(coffeefiltersworkwell)an
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