九年級英語教案-仁愛版九年級英語上冊Unit2 Saving the Earth（Topic2 All these problems are very serious.SectionC）教案

Word九年級英語教案-仁愛版九年級英語上冊Unit2SavingtheEarth（Topic2Alltheseproblemsareveryserious.SectionC）教案

Themainactivityis1a.本課重點活動是1a。(2)Theheatfromthesuncan’tescapesothetemperatureisrising.S5:Collectandreusewastewater.Ss:Cuttingdowntoomanytrees.

(展示1a第二幅圖畫。)

T:Yes.Allovertheworld,peoplehavecutdownmillionsoftrees.Andtreesbecomefewer.

(板書并要求學(xué)生掌握。)找教案http://.

millionsof

T:Cuttingdowntoomanytreescausesthebadweather.Howcantreesaffecttheweather?

S1:Theycankeepwaterfromrunningaway.

S2:Theycanstop…

S3:…

T:Yes.Treescanstopthewindandwaterfromtakingtheearthaway.

(板書并要求學(xué)生掌握。)

takeaway

2.(繼續(xù)探討上述問題，引出新詞匯。)

T:Anythingelse?

(如果沒有學(xué)生回答，繼續(xù)如下問題。)

T:What’stheairlikeintheforest?

Ss:It’sfresh.

T:Yes.Why?

Ss:(允許學(xué)生用漢語回答。)樹能吸收二氧化碳并釋放氧氣。

T:That’sright.Treescanbreatheincarbondioxideandbreatheoutoxygen.

(展示1a第五幅圖。)Pleaselookatthepicture.

(板書并要求學(xué)生理解。)

carbondioxide:CO2

oxygen:O2

T:WheredoesCO2comefrom?

S4:Animals’breathing.

S5:Burningoil.Forexample,carsandbuses.

T:Yes.Theyhavepollutedtheair.Carbondioxideintheairhasincreasedalot.Thishasformeda“blanket”aroundtheearth.

(板書并要求學(xué)生理解。)

blanket

T:Theheatfromthesuncan’tescape,sothetemperatureisrising.

(板書并要求學(xué)生掌握rise；理解escape。)

escape

rise

T:Thisiscalled“thegreenhouseeffect”.

(板書并要求學(xué)生理解。)

thegreenhouseeffect

T:Whathappenstotheicebergs(冰川)?

Ss:Somepartsofthemchangeintowater.

T:Soitcausestheleveloftheoceanstorise.

(板書并要求學(xué)生掌握。)

level

T:(展示1a第4幅圖。)Pleaselookatthispicture.Aroundtheearth,there’saspecialkindofoxygencalled“ozone”.

(板書并要求學(xué)生理解。)

ozone:O3

T:Butnowairpollutionisdestroyingitandthathasmadeaverybigholeintheozonelayer.

(板書并要求學(xué)生理解。)

ozonelayer

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