Theearthisourhome；wemusttakeCareofit．Thismeanskeepingth...
問題詳情：Theearthisourhome；wemusttakeCareofit．Thismeanskeepingtheland，airandwaterclean． Pollutionisadirtyword．Topollutemeanstomakethingsunfit(不合適的)oruncleantouse．Pollutioncomesinmanyways．Weseei...