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10AirWhat’sthematter,Kitty?Areyoucrying?I’mnotcrying.Myeyeshurt.It’sthesmoke.Whereisthesmokefrom?It’sfromthecarsandbuses.Lookattheblacksmokefromthefactory.Itmakestheairdirty.Let’sgotothepark,Ben.Theairiscleanthere.OK.Theairissofreshhere.Yes.Therearealotoftreesinthepark.Treeskeeptheairclean.Weshouldplantmoretreesandkeeptheairclean.Yes!Weshouldkeepourcityclean.Thesmokeinthestreetcomesfromcars,busesandfactories.Theairisdirtyinthestreet.Theairiscleanandfreshinthepark.Therearealotoftreesinit.Treeskeeptheairclean.Isairimportant?Why?Air,waterandfoodkeepusalive.Wecanlivewithoutfoodforfiveweeks.Wecanlivewithoutwaterforfivedays.Wecanlivewithoutairforonlyfiveminutes.TheaironEarthisgettingdirty.Airpollutioncomesfromfactories.AIRPOLLUTIONWeburncoaltomakeelectricity.Factoriesgiveoutalotofsmoke.Lookatthepictures.Talkaboutthemwithyourclassmates.S1:Whatmakestheairdirty?S2:Thesmokefrom…makestheairdirty.S1:Whatshouldwedotokeeptheairclean?S2:Weshould…√√√√√√××√×OurfutureWhichdoyouwant?WeonlyhaveoneEarth!Wemustkeepithealthy!1.Listentoandread“Listenandsay”&“Sayandact”onStudent’sBookpages68and70.2.Finishyourposteraboutair.3.FinishWorkbookpages60and61.