这几个填什么?asweallknow,therearemanykindsofpollutioninourlife,suchaswaterpollution,noisepollutionandairpollution.A__1___theseairpollutionisoneofthemostseriousproblems.P__2___aircanmakeussickorevenkillus.Eve

　　这几个填什么?

　　asweallknow,therearemanykindsofpollutioninourlife,suchaswaterpollution,noisepollutionandairpollution.A__1___theseairpollutionisoneofthemostseriousproblems.P__2___aircanmakeussickorevenkillus.Everyonewantstostopit,butitisadifficultproblemtosolve.Mostofourairpollutioniscausedbythingspeopleneed,suchascarsandairplanes.Thencausepollutionbuttheyalsop__3__transprotation.Andfactoriescauseairpollutionbuttheyprovidepeoplewithj__4__andproducts.Incrowdedcities,factoriesandcarscanaddtonsofpollitiontotheaireveryday.Nobodylikesairpollution.Itsmellsbad;itmakesitdifficulttob__5__.Itevend__6__theplantsthatprovideuswithfood.Nowonderwegetsick.Itisdangeroustoeveryone'sh__7__.Andeveryoneshouldknowit.Whenairpollutioncanevendamagestrongmaterialslikesteelandconcrete,thinkwhatitdoestopoorhumans.