goodafternoon．

　　asweallknow,theearthisaplanetalmostcoveredbywater，anditiswatermadeeverythingontheearthlively．waterisalsooneoftheimportantpartofourenvironment．though，istherereallysomuchwaterforustoclean，toproducemanythings，toplaywith?howmuchwaterarethereontheearththen?

　　mostofthewaterisintheoceansorlockedawayasice．thelargestvolumesoffreshwaterarestoredundergroundasgroundwater，imaginethereisonlyonebarrelofwaterintheworld，thenthereisonlyaspoonofitontheland，andthewaterwecanuseisonlyadropofit．nowihavetoremindallofyouherethatthesingledropofwaterisneverascleanasbefore，ithasbeenpollutedseverelybyourhumanbeings．

　　thereisaverybeautifulriverinparis．itistheseine，itrunsacrossthecity，peopledrinkcoffee,chatonthebankintheday，atnight，theyenjoythebeautifulsceneryintheboat，songsfromtheriverflyintotheskymadetherivermoreattractive,theseineisafamoussymboloffrance；onthewestcoastofpacificoceanthereliesthemoderncityshanghai，anotherriverwhichusedtobeaveryimportanttransportationrouterunsthroughthecenterofthecity，peoplerespectedandregarditas"mother"．itisthe"suzhouriver，butlbelievethatfewofyouwouldsitbesideit，peoplewillbescatteredbytheterriblesmellofwaterwhenwalkby．ihavetosayitisextremelydirty!andweallknowthatalotofbeautifulriversintheworldalsoaresharingthesamefatewithsuzhouriver．whoisthedevil?ican'thelpasking．

　　manyhumanactivitiesandtheirby-productshavethepotentialtopollutewater.pleasehavealookalongthebanksoftheriver,largeandsmallindustrialenterprisesdischargedirty

　　water,tonsofgarbagewerethrownintotheriver,thewatercontainedsomuchthatitcan'tcleanitself.comparedwiththedramaticdevelopmentinmanysidesofshanghai,thesuzhouriverhasbecomeablackpointoftheappearanceofcity.

　　fortunately,thegovernmenthascontrolthesituationnow,wearehappytoseesomepartsoftheriverhasbecomecleanagain,andweevencanfindfishsometime.

　　theuniqueearthistheonlyplanetfulloflives,thewaterisjustlikethebloodintheactivebody,protectingwaterissavingourselves.nottowasteasingledropofwater,otherwise,theonlydropofwaterwecouldkeepinthefuturewouldbeourtear!

　　mydearfriends,mankindstillfacesagreatdifficultyinsolvingtheproblemsoftheenvironmentanddevelopment,andthereisagrandtasktoperformandalongwaytogo.themiddleschoolstudentsinchinawillalwayscooperatewiththeyoungpeopleoftheworldtoprotecttheenvironment.

　　thefutureisourstobuild!

　　thanksforlistening.