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第第页介绍水的英语课前演讲稿

介绍水的英语课前演讲稿4

SavingWaterTheworldisnotonlyhungry,butalsothirstyforwater.Thismayseemstrangetoyou,sincenearly75%oftheearth'ssurfaceiscoveredwithwater.Butabout97%ofthishugeamountisseawater,orsaltwater.Mancanonlydrinkandusetheother3%--thefreshwaterthatcomesfromrivers,lakes,underground,andothersources.Andwecannotevenuseallofthat,becausesomeofitisintheformoficebergsandglaciers.Evenworse,someofithasbeenpolluted.However,asthingsstandtoday,thissmallamountoffreshwater,whichisconstantlybeingreplacedbyrainfall,isstillenoughforus.Butourneedforwaterisincreasingrapidly--almostdaybyday.Onlyifwetakestepstodealwiththisproblemnowcanweavoidasevereworldwidewatershortagelateron.Alimitedwatersupplywouldhaveabadeffectonagricultureandindustry.Letmegiveyoujustonesmalle*ampieofhownecessarywateristoindustry.Didyouknowthattoproduceasingletonofsteel,ittakesabout91,000litersofwater?Weallhavetolearnhowtostopwastingourpreciouswater.Oneofthefirststepsweshouldtakeistodevelopwaysofreusingit.E*perimentshavealreadybeendoneinthisfield,butonlyonasmallscale.Forus,thesystemsareasimportantasthespacecraft.

介绍水的英语课前演讲稿5

wheniwasyoung,ialwaysdreamedthatilivedinabeautifulcountry.thereweremanyflowersandtreesaroundourcity.wecounldhearthebirdssingingandseethechildrendancing.thestreetswereclearandthetheairwasveryfresh!howniceitwas!butthatonlywasadreamofmine!howiwishthatitwouldbecometrue!soithinkweshoulddosomethingtoprotectourenvironment.everyoneshouldmakeacontributiontoprotecttheenvironment.takingcareofourenvironmentisveryimportant.whereveryoulive,youcandosomethingaroundyourneighbourhood.haveyoueverthrownanylitterontotheground?haveyoueverdrawnpicturesonpublicwalls?haveyoueverspatinapublicplace?haveyouevercutdowntrees?ifyouranswersare"no",itmeansthatyouhavealreadyhelpedprotectourenvironment.itisourdutytokeepourenvionmentcleanandtidy.youmightaskyourself,"haveieverpickedupsomerubbishandthrownitintoadustbin?haveievercollectedwastepaperorbottlesforrecycling?haveieverplantedanytreesorflowersinornearmyneighbourhood?"ifyouranswersare"yes",itmeansthatyouhav

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