场景：寝室，A推门而入A：I’mcomingback!B:Hi,welcomeback.C:Howdidyourholidaygo?A:.IvisitedWestLakeduringtheMayDayD:westlake?Isitbeautiful?A:oh,itwasn’tsobeautifulasweheardbefore.Therearesomanyplasticbagsaroundanditdestroyedtheenvironmenttoadegree.B:Ican’tagreewithyouanymorethatwedogreatdamagetotheenvironment.justinourschool,therearemanyplaceswhichhavebeenpolluted,suchasthegreatlawn.C:Asyoucansee,ourstreetissurroundedbywhiteplastic.Therearealwaysgarbagebagsintheroad,discardedsnackbagsonthestairs,andwastepaperinthedormitory.Thatreallyisabadphenomenon.D:thesnakestreetnearthesouthgateinourschoolisalsoasourceofwhitepollution.everydaywhenIpassedbyIsawalotofplasticbagsandfoamboxes.it’stoodutyandsmelly.A:Yeah,whitepollutioncausessomanyharmstoourlife.Whenalotofplasticbagsovertheground,wefeelitdirtyandsmelly,especiallyinthetouristsattractions.B:atthesametime,soilpollutionisbecomingabigproblem.plasticbagsnotonlyoccupytoomuchlandbutalsohavedifficulityinresolving,whichcanstay200-500yearsonland.Soplasticwillpollutesoilaswellasaffecttheoutputofcropsheavily.C:Soterribly.Plastic,paperscraps(纸屑）anddustinthewindfloatinthesky,leadtoairpollution.Especiallyinourningbouniversity,windissocrazy.I’mafraidofbreathingsodirtyair.D:what’smore.thewaterwillbepollutediftheplasticfloatintoriver,anditwillbeabigthreatentofishandotheranimalsliveintheriver.B:thereisnodoubtthanmanyreasonscausethispollution.let’smakeaconclusion.A:Theyareeasytouseandmakepeople’slifemoreconvienient.Butmostpeoplejustthrowthemeverywhereafterusing,whichcauseswhitepollution.B;Wasteagriculturalplasticproducts(suchasfilms)isalsooneofthecauses.manyfamersthrowouttheproductsaftertheyfinishthework.Asaresult,thisbecomeabigproblem.C:Inhospital,doctorscheckhundredsofpatientseveryday,likedentists.Sotheyuselotsofdisposablegloves,injectorsandothersmedicaldevices.Buthowtodealwithnumerousdisposablemedicalsupplieseveryday,it’saseriousproblem.D:plasticstakedecadesorevencenturiestobreakdownintocarbondioxidewaterandothersubstanceafterbei