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1、PASSAGE13 AThirstyWorld Theworldisnotonlyhungry,itisalsothirstyforwater.Thismayseemstrangetoyou,sincenearly75%oftheearth’ssurfaceiscoveredwithwater.Butabout97%ofthishugeamountissea-water,orsaltwater.Mancanonlydrinkandusetheother3%--thefreshwatertha
2、tcomesfromrivers,lakes,underground,andothersources.____1____,becausesomeofitisintheformoficebergsandglaciers.Evenworse,someofithasbeenpolluted. Atthemoment,hissmallamountoffreshwaterisstillenoughforus.However,ourneedforwaterisincreasingrapidly.Onlyi
3、fwetakestepstodealwiththisproblemnow,canweavoidasevereworldwidewatershortagelateron.Oneoftheusefulstepswecantakeistostopunlimiteduseofwater.____2____,however,wouldhaveabadeffectonagricultureandindustry. Inadditiontostoppingwastingourpreciouswater,on
4、emoreusefulstepweshouldtakeistodevelopwaysofreusingit.____3____,butonlyonasmallscale. Today,inmostlargecities,waterisusedonlyonceanditeventuallyreturnstotheseaorrunsintoundergroundstoragetanks.____4____thathasbeenusedtoapurifyingplant.Thereitcanbefi
5、lteredandtreatedwithchemicalssothatitcanbeusedagainjustasifitwerefreshfromaspring. ___5____,westillwouldnothaveenough.Wherecouldweturnnext?Totheoceans!Allwe’dhavetodotomakeuseofthevastamountofsea-wateris-removethesalt.Thissalt-removingprocessisalrea
6、dyinuseinmanypartsoftheworld.Soifwetakeallthesesteps,we’llbeinnodangerofdryingup! A.AlimitedwatersupplyB.ButitispossibletopipewaterC.ItispossibletopurifylargeamountsofseawaterD.ButevenifeverylargecitypurifiedandreuseditswaterE.Andwecannotevenuseallof
7、thatF.ExperimentshavealreadybeendoneinthisfieldKEYS:EAFBD PASSAGE14 LookingtotheFuture Whenamagazineforhigh-schoolstudentsaskeditsreaderswhatlifewouldbelikeintwentyyears,theysaid:Machineswouldberunbysolarpower.Buildingswouldrotatesotheycouldfollowth
8、esuntotakemaximumadvantageofitslightandheat.Wallswould"radiatelight"and"changecolorwiththepushofabutton."Foodwouldbereplacedbypills.Schoolwouldbetaught"byelectricalimpulsewhilewesleep.’’Carswouldhaveradar.Doesthissoundliketheyear2000?Actually,_______
