2025年春沪教版九年级下册英语上课课件 3.1 Reading.pptx

Theenvironment;1.WhathasLodone?

Hehaspaintedhimselfgreen.

2.WhatdidHitellLotodo?

HetoldLotobegreener.

3.DoesLounderstandwhatHimeant?

No,hedoesn’t.

4.WhatdidHimeanwhenhetoldLotobegreener?

HemeantthatLoshouldcaremoreabouttheenvironment.;Whatdothepicturestellus?;Heavysmokefromchimneysandwastegasesfromcarsortruckspolluteourair.;Lotsofunrecyclableplasticlunchboxesareusedandthenthrownawaybypeople.;;Whatdoyouknowabout…?;A1Whatdoyouknowaboutthegreenhouseeffect?MatchthefirsthalfofthesentencesincolumnAwiththesecondhalfincolumnB.Writethecorrectlettersintheblanks.;ThegasescausetheatmospheretokeepintoomuchheatfromtheSun.;A2Whatistheresultofthegreenhouseeffect?Ingroups,discussthis

withyourclassmates.;Environmentalproblems.;Ourworldisindanger.Wemustdosomethingtoprotecttheenvironment.But,whatarethemainproblemsweface?

Thegreenhouseeffect

TheatmospherearoundtheEarthisnecessaryforalllivingthings.Itisliketheglassofagreenhouse,lettingsunlightinandkeepingheatfromgettingout.Withoutit,theEarthwouldbethesameastheMoon—coldandlifeless.

Whenweburnfuelssuchaspetrolandcoal,weproduceagascalledcarbondioxide(CO2).Toomuchofthisgaspollutestheatmosphere,andcausesittokeepintoomuchheat.Asaresultofthegreenhouseeffect,theEarth’stemperatureisincreasing.Thiscausessealeveltorise,andinthefuturemaycausecitiestodisappear.

Cuttingdownforests

Everyyear,wedestroynaturebycuttingdownhugeareasofforests.ThismakesthegreenhouseeffectworsebecausetreestakeinCO2andproduceoxygen.Cuttingdowntreesalsodestroysthehomesoftheanimalsthatliveinourforests,andcausesthesurfaceofthesoiltobeeasilydestroyedbyrain.Thiscanresultinfloodsandevenmoredamagetotheenvironment.;Badhabits

Manyof