完形填空。Manyscientistssaythattheworldisgettinghotterandhotter.IftheyarerighttheiceattheNorthandSouthPolewillmelteventually.Ifthishappenstheseawill1andmaycovermost2allo

　　完形填空。 Manyscientistssaythattheworldisgettinghotterandhotter.IftheyarerighttheiceattheNorthand

　　SouthPolewillmelteventually.Ifthishappenstheseawill 1 andmaycovermost 2 allofSingapore.This

　　willforceeverybodytomovetoa 3 country.

　　Weknowthatthesun 4 theearth.Theheatfromthesunhitsthe 5andsomeof 6 goesbackintothe

　　sky.Howeverfactoriesandcars 7 alotofcarbondioxide(二氧化碳).Whenthegasrisesintotheskythe

　　heatfromthesuncancome 8 thembuttheheatfromthegroundcannot.It 9 nearusintheskyandmakes

　　the 10 hotterandhottereveryyear.

　　Scientistscallthisthe"greenhouseeffect"becauseagreenhouseisasmallglass11 whichishotinside.It

　　isusedfor12 plantsincoolcountries.Manycountriesare13 aboutthegreenhouseeffect.Theyaretrying

　　tostopfactoriesandcarsfromsending14 gasesintothesky.Scientistsarenotsurewhentheworldwillget

　　muchhotter.Somepeoplesaythatthegreenhouseeffecthas15 alreadyandhasbeguntoaffecttheworld's

　　weather.( )1.A.rise

　　( )2.A.and

　　( )3.A.hotter

　　( )4.A.shines

　　( )5.A.ground

　　( )6.A.them　

　　( )7.A.make

　　( )8.A.through

　　( )9.A.hides

　　( )10.A.cloud

　　( )11.A.building &nbs