Theearthisourhome.Wemusttakecareofit.Thismeanskeepingthelandairandwaterclean.Pollutionisa"dirty"word.Topollutemeanstomakethingsdirty.Pollutioncomesinmanyforms.Weseeitsmellitanddrinkit.Pollutionisbegi

　　Theearthisourhome.Wemusttakecareofit.Thismeanskeepingthelandairandwaterclean.

　　Pollutionisa"dirty"word.Topollutemeanstomakethingsdirty.Pollutioncomesinmanyforms.Weseeitsmellitanddrinkit.Pollutionisbeginningtodoharmtoourhealthandeventoourlife.

　　Manhasbeenpollutingtothehealthfromthetimehefirstmadehisfirewashedhisclothesinriverandthrewhisrubbishontheground.Manyyearsagotheproblemwasnotsoseriousbecausetherewerenotsomanypeople.Allthedirtythingswouldsoonbecoveredup.Therewasplentyofcleanairlandandwater.Whenthelandwasuseduportheriverwasdirtyinaplacemenmovedtoanotherplace.Butthisisnolongertrue.Manisnowslowlypollutingthewhiteworld.

　　Talkingaboutpollutionweoncemeanairpollution.Itistruethatairpollutionisstillthemostdangerousnowbutitisonlyakindofpollution.

　　Wearegladtosaythatthepublichasbeenwarnedofthedangersofpollutionandalargenumberofpeopleareworkinghardtogetridofit.

　　( )6.Totakecareoftheearthmeans .

　　A.keepingthelandclean B.keepingtheairclean

　　C.keepingthewaterclean D.A.BandC

　　( )7.Pollution .

　　A.onlyharmstoourhealth B.harmsourhealthandlife

　　C.onlyharmstoourlife D.doesn'tanyharm

　　( )8.Whydoesmanmovefromoneplacetoanother?

　　A.Becausethelandisusedup.

　　B.Becausetheyneedtofindmorefood.

　　C.Becausethewaterispolluted.

　　D.AandC.

　　( )9.Nowifwetalkaboutpollutionwemean .

　　A.onlyairpollution B.waterpollution

　　C.allkindsofpollution D.landpollution

　　( )10.WhichofthefollowingisNOTright?

　　A.Nownoonetakesanyeffortsingettingridofpollution.

　　B.Manhadbeingpollutingeversincehehasbeinghere.

　　C.Pollutionharmstoourhealthandlife.

　　D.Oncewetalkedaboutpollutionweonlymeanairpollution.