英语六级备考阅读练习与答案Word下载.docx

英语六级备考阅读练习与答案Word下载.docx

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Butinmemoiraftermemoir，celebritiesrevealtheunhappinesshiddenbeneathalltheirfun：

depression，alcoholism，drugaddiction，brokenmarriages，troubledchildrenandprofoundloneliness.

　　Askabachelorwhyheresistsmarriageeventhoughhefindsdatingtobelessandlesssatisfying.Ifhe‘shonest，hewilltellyouthatheisafraidofmakingacommitment.Forcommitmentisinfactquitepainful.Thesinglelifeisfilledwithfun，adventureandexcitement.Marriagehassuchmoments，buttheyarenotitsmostdistinguishingfeatures.

　　Similarly，couplesthatchoosenottohavechildrenaredecidinginfavorofpainlessfunoverpainfulhappiness.Theycandineoutevertheywantandsleepaslateastheywant.Coupleswithinfantchildrenareluckytogetawholenight‘ssleeporathree-dayvacation.Idon’tknowanyparentwhowouldchoosethewordfuntodescriberaisingchildren.

　　Understandingandacceptingthattruehappinesshasnothingtodowithfunisoneofthemostliberatingrealizationswecanevercometo.Itliberatestime：

nowwecandevotemorehourstoactivitiesthatcangenuinelyincreaseourhappiness.Itliberatesmoney：

buyingthatnewcarorthosefancyclothesthatwilldonothingtoincreaseourhappinessnowseemspointless.Anditliberatesusfromenvy：

wenowunderstandthatallthoserichandglamorouspeopleweweresosurearehappybecausetheyarealwayshavingsomuchfunactuallymaynotbehappyatall.

　　1.Whichofthefollowingistrue?

　　A.Funcreateslong-lastingsatisfaction.

　　B.Funprovidesenjoymentwhilepainleadstohappiness.

　　C.Happinessisenduringwhereasfunisshort-lived.

　　D.Funthatislong-standingmayleadtohappiness.

　　2.Totheauthor，Hollywoodstarsallhaveanimportantroletoplaythatisto__.

　　A.ritememoiraftermemoirabouttheirhappiness.

　　B.tellthepublicthathappinesshasnothingtodowithfun.

　　C.teachpeoplehowtoenjoytheirlives.

　　D.bringhappinesstothepublicinsteadofgoingtoglamorousparties.

　　3.Intheauthor‘sopinion，marriage___.

　　A.affordsgreaterfun.

　　B.leadstoraisingchildren.

　　C.indicatescommitment.

　　D.endsinpain.

　　4.Coupleshavinginfantchildren___.

　　A.areluckysincetheycanhaveawholenight‘ssleep.

　　B.findfunintuckingthemintobedatnight.

　　C.findmoretimetoplayandjokewiththem.

　　D.derivehappinessfromtheirendeavor.

　　5.Ifonegetthemeaningofthetruesenseofhappiness，hewill__.

　　A.stopplayinggamesandjokingwithothers.

　　B.makethebestuseofhistimeincreasinghappiness.

　　C.giveafreehandtomoney.

　　D.keephimselfwithhisfamily.

　　参考答案：

CBCDB

PassageTwo

HowOzonePollutionWorks

　　A）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）andpotassiumiodide（canbeorderedfromascienceeducationsuppliersuchasCarolinaBiologicalSupplyorFisherScientific）.Basically,youmakeapastefromwater,cornstarchandpotassium-iodide,andyoupaintthispasteonstripsoffilterpaper.Youthenexposethestripstotheairforeighthours.Ozoneintheairwillreactwiththepotassiumiodidetochangethecolorofthestrip.Youwillalsoneedtoknowtherelativehumidity,whichyoucangetfromanewspaper,weatherbroadcastorhomeweatherstation.

　　F）Whenyouinhaleozone,ittravelsthroughoutyourrespiratorytract.Becauseozoneisverycorrosive,itdamagesthebronchiolesandalveoliinyourlungs,airsacsthatareimportantforgasexchange.Repeatedexposuretoozonecaninflamelungtissuesandcauserespiratoryinfections.

　　G）Ozoneexposurecanaggravateexistingrespiratoryconditionssuchasasthma,reduceyourlungfunctionandcapacityforexerciseandcausechestpainsandcoughing.Youngchildren,adultswhoareactiveoutdoorsandpeoplewithrespiratorydiseasesaremostsusceptibletothehighlevelsofozoneencounteredduringthesummer.Inadditiontoeffectsonhumans,thecorrosivenatureofozonecandamageplantsandtrees.Highlevelsofozonecandestroyagriculturalcropsandforestvegetation.

　　H）Toprotectyourselffromozoneexposure,youshouldbeawareoftheAirQualityIndex（AQI）inyourareaeveryday—youcanusuallyfinditinthenewspaperoronamorningweatherforecastonTVorradio.YoushouldalsobefamiliarwiththeU.S.EnvironmentalProtectionAgency（EPA）guideforozone-alertvalues.

　　I）WhatdothenumbersintheAQImean?

TheAQImeasuresconcentrationsoffiveairpollutants:

ozone,sulfurdioxide,particulatematter,carbonmonoxideandnitrogendioxide.TheEPAhaschosenthesepollutantsascriteriapollutants,butthesearenotallofthepollutantsintheair.Theseconcentrationsarecomparedtoastandardsetoutinfederallaw.Anindexvalueof100meansthatallofthecriteriapollutantsareatthemaximumlevelthatisconsideredsafeforthemajorityofthepopulation.Toreduceyourexposuretoozone,youshouldavoidexercisingduringafternoonandearlyeveninghoursinthesummer.

　　J）Thereareseveralwaysyoucanhelptodecreaseozonepollution.Limitusingyourautomobileduringafternoonandearlyeveninghoursinthelatespring,summerandearlyfall.Donotusegasoline-poweredlawnequipmentduringthesetimes.Donotfuelyourcarduringthesetimes.Donotlightfiresoroutdoorgrillsduringthesetimes.Keeptheengineofyourcarorboattuned.Makesurethatyourtiresareproperlyinflated.Useenvironmentallysafepaints,cleaningandofficeproducts（someofthesechemicalsaresourcesofVOC）.

　　K）Besidespersonalattemptstoreduceozonepollution,theEPAhasinitiatedmorestringentair-qualitystandards（suchastheCleanAirActanditsmodifications）toreduceairpollution.Compliancewiththesestandardsbyindustries,manufacturersandstateandlocalgovernmentshassignificantlyreducedthelevelsofmanycommonairpollutants.

　　L）Withcontinuedconservationandreductionpractices,adherencetoozone-pollutionwarnings,researchandgovernmentregulation,ozone-pollutionlevelsshould

　　continuetofall.Perhapsfuturegenerationswillnotbethreatenedbythisenvironmentalpollutant.

　　M）Thethingthatdetermineswhetherozoneisgoodorbadisitslocation.Ozoneis‘‘good，，whenitisinthestratosphere.Thestratosphereisalayeroftheatmospherestartingatthelevelofabout6miles（about10kilometers）abovesealevel.Thestratospherenaturallycontainsaboutsixpartspermillionofozone,andthisozoneisverybeneficialbecauseitabsorbsUVradiationandpreventsitfromreachingus.

　　N）Ozoneis“bad”whenitisatgroundlevel.Ozoneisaveryreactivegasthatishardonlungtissue.Italsodamagesplantsandbuildings.Anyozoneatgroundlevelisaprobl