Asweallknow,theearthisaplanetalmostcoveredbywater,anditiswatermadeeverythingontheearthlively．Waterisalsooneoftheimportantpartofourenvironment．Though,istherereallysomuchwaterforustoclean,toproducemanythin

　　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,theonly