EARTH4AIR6WATER8大家学习辛苦了，还是要坚持Manypartsoftheworldwithlargepopulationandplentyofcropshavebecomedesert.2.Landmaybecomepooriffarmersdonotlimittheircattle.3.Goodsoilisgraduallylostthesedaysastreesarebeingcutdown.4.Airpollutionandwaterpollutionarethetwocausesofproblemthatmanypartsoftheworldhavebecomedesert.5.Chemicalsinthesmokefrompowerstationscantravelhundredsofmilesbeforefallingdowntotherain.6.Afterabadaccidentatanuclearpowerstation,50%ofthetreesinGermanyweredamaged.7.ThewriterusestheexamplesoftheaccidentsinbothIndiaandRussiatoexplainhowwaterispolluted.8.Onceoceansarepolluted,theyarenotabletocleanthemselves.Manypartsoftheworldwithlargepopulationandplentyofcropshavebecomedesert.(T)2.Landmaybecomepooriffarmersdonotlimittheircattle.(T)3.Goodsoilisgraduallylostthesedaysastreesarebeingcutdown.(T)4.Airpollutionandwaterpollutionarethetwocausesofproblemthatmanypartsoftheworldhavebecomedesert.(F)5.Chemicalsinthesmokefrompowerstationscantravelhundredsofmilesbeforefallingdowntotherain.(F)6.Afterabadaccidentatanuclearpowerstation,50%ofthetreesinGermanyweredamaged.(F)7.ThewriterusestheexamplesoftheaccidentsinbothIndiaandRussiatoexplainhowwaterispolluted.(F)8.Onceoceansarepolluted,theyarenotabletocleanthemselves.(F)ThemainideaofeachpassageWhatkindofpollutioncanyouthinkof?(2)Whytreesareimportant?(3)Whatarethecausesofwaterpollution?(4)Whatcanbedonetostoplandfrombecomingintodesert?(5)Whatelsedoweknowabouttheproblemsthattheearthisfacing?(6)Whatstepsshouldwetaketosavetheearth?Alotofdamagehasalreadybeendonetotheearth,includingpollution,nuclearwaste,radiationandsoon.Wearealsoawarethatthereisonlyoneearthforus.Sotheideathateveryoneshouldkeepinhisorhermindisstoppinganydamagetotheworldandsavingtheearth.practice