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页眉内容来源于网络Unit1PartTwo:ReadandPracticeReadandThinkII.Answerthefollowingquestionsaccordingtothetext.1.WhatarethemaintypeofairPollution?An.:Theseincludesmog,acidrain,thegreenhouseeffect,andholesintheozonelayer.2.Wheredoesexhaustcomefrom?An.:Theexhaustcomesfromburningfuelsinautomobiles,homes,andindustries.3.Whyistheamountofcarbondioxideintheaircontinuingtoincrease?An.:Carbondioxideisproducedwhenfuelsareburned.Plantsconvertcarbondioxidebacktooxygen,butthereleaseofcarbondioxidefromhumanactivitiesishigherthantheworld'splantscanprocess.Thesituationismadeworsesincemanyoftheearth'sforestsarebeingremoved,andplantlifeisbeingdamagedbyacidrain.4.Canpollutantsbecreatedbyindooractivities?An.:Yes.Somepollutantscanbecreatedbyindooractivitiessuchassmokingandcooking.5.Whatisthefirststeptosolveairpollution?An.:Thefirststeptosolveairpollutionisassessment.III.Putinthemissingwordsaccordingtothetext.Thereareseveralmaintypesofpollutionandwell-knowneffectsofpollution.Onetypeofairpollutionisthereleaseofparticlesintotheairfromburningfuelforenergy.Anothertypeofpollutionisthereleaseofharmfulgasesintheatmosphere,formingsmogandacidrain.Thegreenhouseeffectisalsoreferredtoasglobalwarming.Inmanycountriesintheworld,stepsarebeingtakentostopthedamagetoourenvironmentfromairpollution.Theyhavesetcontrolsonpollutionemissionsfortransportationvehiclesandindustryandwemustmeetthechallengeinordertoassurethatahealthyenvironmentwillexistforourselvesandourchildren.ReadandCompleteIV.Spellthefollowingwordswiththehelpoftheirmeaningsandfirstletters.1.essentiala.absolutelynecessary.Vitallynecessary2.substancen.thatwhichhasmassandoccupiesspace3.significanta.important;ofconsequence;havingorexpressingameaning4.well-beingn.acontentedstateorbeinghappyhealthyandprosperous5.exhaustn.gasesejectedfromanengineaswasteproducts6.convertv.tochangethenature,purpose,orfunctionofsomething7.reactionn.aprocessinwhichoneormoresubstancesarechangedintoothers8.derivev.toobtain;tocomefrom9.consequencen.theoutcomeofaneventespeciallyasrelativetoanindividual10.exposuren.thestateofbeingputintoasituationinwhichsomethingharmfulordangerousmightaffectyouV.Completeeachofthefollowingstatementswiththewordsyouhavelearnedinthetext.1.Heexplainedthathisdelaywasduetoanaccident.2.Foreveryactionthereisanequalandoppositereaction.3.Thisisoneofthemostsignificantstudiesofthesubject.4.Thisgardenhasthebestcollectionofnativeplants.Inaddition,itcontainsnumerous页眉内容来源于网络treesandflowersfromoverseas.5.Thepaintcameoffastheresultofexposuretotherain.VI.Fillintheblankswiththeproperwordsandexpressionsgivenbelow,changingtheformifnecessary.1.Werefertocopperandsilverasgoodconductors.2.Herepatienceisessential.3.Thecompanysupply,thechildreninthemountainareawithalotofbooks.4.Thesephenomenaareverycommonnow.5.TheseEnglishwordsderivefromGreek.6.Thestormcauseduntolddamagetothefarmer’sproduction.7.Theregioncontinuestosufferfromseriouspollution.8.Howdoyouconvertironintosteel?9.ClimatechangecouldhaveseriousconsequencesforAfrica.10.Theharmfulsubstancesreleasedintotheenvironment.VII.Wordbuilding.Nowadd-entoeachofthewordsbelowandthencompleteeachofthefollowingsentenceswithoneofthefinishedwords.Sharp-sharpen;deep-deepen;high-heighten;bright-brighten;short-shorten;broad-broaden;wide-widen;quick-quicken;dark-darken;long-lengthen.1.Johnglancedathiswatchandquickenedhispace.2.Theroadbroadenedintoanimposingavenuelastyear.3.HisexpressionbrightenedwhenImentionedthemoney.4.Thegapbetweenincomeandexpenditurehaswidenedto10%.5.Theyaretalkingaboutshorteningtheworkingweek.6.Thebadnewsdarkenedtheirviewofthesituation.7.It’sanopportunityforyoungpeopletodeepentheirunderstandingoftheworld.8.Theteacheradvisespupilstosharpenalltheirpencilsbeforethetest.9.Thedirectorusesmusictoheightentensioninthescene.10.Thedayslengthenedassummerapproached.VIII.PayattentiontotheitalicizedpartsintheEnglishsentencesandtranslatetheChinesesentences.1.示例：Airsuppliesuswithoxygenwhichisessentialforourbodiestolive.Treesandflowerscansupplyuswithfreshairandbeautifulview.这家公司的任务是向周围的住户供应煤气。译：Thetaskofthiscompanyistosupplythehomesaroundwithgas.他们向受洪灾地区(theflood-strickenarea)的人们提供了食品援助(aids)。译：Theysuppliedthepeopleintheflood-strickenareawithfoodaids.2.示例：Thistypeofpollutionissometimesreferredtoas“blackcarbon”pollution.HeisreferredtoasalivingShakespeare.他们称他是一位政治家。译：Theyreferredtohimasapolitician.那些在办公室工作的人被称为“白领(whitecollar)工人”。译：Peoplewhoworkinofficesareusuallyrefertoas“whitecollarworkers”.3.示例：Thesecantakepartinfurtherchemicalreactionsoncetheyareintheatmosphere,formingsmogandacidrain.Onceyoustart,youwillnevergiveup.钱一旦花光了，我们就回不了家了。页眉内容来源于网络译：Oncethemoneyhasgone,wecannotgobackhome.一旦出版，这本词典将会非常畅销！译：Onceprinted,thisdictionarywillbeverypopular!4.示例：Onlythroughtheeffortsofscientists,businessleaders,legislators,andindividualscanwereducetheamountofairpollutionontheplanet.Onlyinabigcitywasitpossibletobuyanewwheelchair.孩子们只有在长大了之后，才能明白父母的辛苦。译：Onlyafterthechildrengrewupcouldtheyunderstandtheirparents'hardworking.我们只有在山顶上才能看到整座城市的美景。译：Onlyatthetopofthemountaincanweseethebeautifulscenesofthewhole