EnvironmentalProtection[34页]

Helpme,please!Producers：吕小艳Severalkindsofpollution---ourenemiesAirpollutionWaterpollutionNoisepollutionLitter...AfamousmottoHewhohasathoroughknowledgeoftheenemyandhimselfisboundtowininallbattles.知彼知己，百战不殆。AirpollutionManyfactoriesdischargeplentyofwasteairwithoutfilteringit.Carsdischargealotofexhaustgas.Afterthewheatisharvested,manyfarmersareburningstraw.Manytreeswerecu...