2019-2020年九年級英語上冊《Unit2SavingtheEarth》Topic2（精編版）

1、素材和資料部分來自網(wǎng)絡，如有侵犯您的權益，請聯(lián)系文庫作刪除處理！2019-2020 年九年級英語上冊 unit 2 saving the earthtopic 2sectionc教案 仁愛版the main activity is 1a.本課重點活動是1a。. teaching aims and demands教學目標1. learn some new words and phrases:on earth, period, millions of, take away, rise, level, refer to2. learn some useful sentences:(1) when i

2、t rains or when the wind blows, the earth is taken away.(2) the heat from the sun cant escape so the temperature is rising.3. learn to talk about the harm of pollution:(1) forests have bee deserts, so more and more sorts of animals and plants are disappearing.(2) as a result, many rivers and lakes a

3、re now dead.(3) too much harmfulradiationfrom thesun passes throughtheholeand reachesthe earth directly.(4) itcauses theleveloftheoceans toriseand theclimateofthe earthtochange.4. develop the students sense of environmental protection. teaching aids教具圖片 / 小黑板. five-finger teaching plan五指教學方案step 1 r

4、eview第一步復習 ( 時間 :4 分鐘 )通過檢查作業(yè)， 引導學生開拓思維，提出保護環(huán)境和水資源的具體措施，復習不定代詞和副詞。為學習新詞匯作準備。( 檢查作業(yè)，并找學生匯報結(jié)果，引導學生如何保護水資源。) t:how do you protect our environment and save water?s1:everyone should plant more trees.s2:we should do everything we can to save water. s3:everybody should know the importance of forests. s4:pa

5、ss laws against water pollution.s5:collect and reuse waste water.step 2 presentation第二步呈現(xiàn)( 時間 :18 分鐘 )教師通過日常對話，借助1a 中的圖片，創(chuàng)設情景，導入新課，呈現(xiàn)新的詞匯。1. (教師由日常對話，引出本課話題，呈現(xiàn)部分新詞匯。) t:whats the weather like today?ss: it st:as we know, beijingoftenhas sandstormsinspring.what causes the bad weather? ss: cutting down

6、 too many trees.( 展示 1a 第二幅圖畫。 )t:yes. all over the world, people have cut down millions of trees. and trees bee fewer.( 板書并要求學生掌握。)- 1 - / 4millions oft:cutting down too many trees causes the bad weather. how can trees affect the weather?s1:they can keep water from running away.s2:they can stop s3:

7、t:yes. trees can stop the wind and water from taking the earth away.( 板書并要求學生掌握。) take away2. (繼續(xù)探討上述問題，引出新詞匯。) t:anything else?( 如果沒有學生回答，繼續(xù)如下問題。) t:whats the air like in the forest?ss: it s fresh. t:yes. why?ss: (允許學生用漢語回答。) 樹能吸收二氧化碳并釋放氧氣。t: that s right. trees can breathe in carbon dioxide and br

8、eathe out oxygen. ( 展示 1a 第五幅圖。 )please look at the picture.( 板書并要求學生理解。 ) carbon dioxide: co 2 oxygen: o 2t:where does co 2 e from? s4:animals breathing.s5:burning oil. for example, cars and buses.t:yes. they have pollutedtheair.carbon dioxideintheairhas increaseda lot. this has formed a“ blanket”

9、around the earth.( 板書并要求學生理解。 )blankett:the heat from the sun can t escape, so the temperature is rising. ( 板書并要求學生掌握rise；理解 escape 。)escape riset:this is called“ the greenhouse effect” .( 板書并要求學生理解。) the greenhouse effectt:what happens to the icebergs(冰川 )? ss: some parts of them change into water.

10、t:so it causes the level of the oceans to rise. ( 板書并要求學生掌握。)levelt:( 展示 1a 第 4 幅圖。 )please look at this picture. around the earth, there s a special kind of oxygen called“ ozone” .( 板書并要求學生理解。) ozone: o 3t:but now airpollutionisdestroyingitand thathas made a verybigholeinthe ozone layer.( 板書并要求學生理解

11、。)ozone layert:too much harmfulradiationfromthesun passes throughtheholeand reachesthe earth.( 板書并要求學生理解。)radiation3. (讓學生快速閱讀1a，用所給的詞組填空。完成1a。)t: we humans have lived on earth for only 35 000 years, but during this periodwe have changed our planeta lotinmany ways.now readthepassage and thenchoose a

12、 proper title for each paragraph from the phrases above the passage.( 板書并要求學生掌握。)on earth, period( 學生完成后與教師核對答案。)4. (教師出示小黑板上的問題，讓學生再讀一遍課文后回答。)(1) have we changed our planet in many ways?(2) have people done good to the earth?(3) why are more and more sorts of animals and plants disappearing?(4) are

13、 many rivers and lakes dead now?(5) is ozone important to the earth? why?(6) has carbon dioxide in the air increased a lot? ( 讓個別學生回答，完成小黑板上的問題。)step 3 consolidation第三步鞏固 ( 時間:8 分鐘 )讓學生再次讀1a，完成 1b，鞏固本課的語言點，培養(yǎng)學生的閱讀能力。1. (讓學生再次讀課文，完成1b。)t: read the passage again. finish 1b alone.( 板書并讓學生猜測mars 和 refer

14、 to的漢語意思。掌握refer to；了解 mars。)mars refer to( 學生完成后，師生核對答案。)2. (讓學生齊讀課文，保證每一個學生參與其中。) t: now please read the passage together.3. ( 教師讓學生討論并找出新的或不懂的語言點，培養(yǎng)學生的自主學習能力。教師解釋學生仍有疑惑的知識點并板書。)4. (讓學生兩人一組討論，完成下面的表格。)t: how many kindsofpollutionare mentionedinthepassage? how do theyaffectour environment? accordin

15、g to 1a, finish the form on the blackboard.( 板書 )kind of pollutioneffectstep 4 practice第四步練習 ( 時間 :10 分鐘)使學生了解各種污染對地球環(huán)境的影響，培養(yǎng)他們的環(huán)保意識。1. (讓學生分組討論，看哪組最快說出o3，co2 和溫室效應的含義及其對環(huán)境的影響，并以此寫一篇短文，完成2。)t:please read the passage again,discussthe meanings of the followingexpressionsin 2 in groups of 4, and then w

16、rite down how they affect the environment. ( 學生討論后，與教師核對答案。)2. (根據(jù)給出的提示詞寫一篇小短文，可先口述。)t: write a short passage with the key words given. ( 板書關鍵詞。)(1) changein many ways(2) important, destroy, too much, harmful radiation, cause cancer (3)increase a lot, blanket, rise, change(4)serious, do somethingste

17、p 5 project第五步綜合探究活動 ( 時間 :5 分鐘 )讓學生討論各種危害地球的污染方式，并就有關污染寫一篇短文，培養(yǎng)學生綜合運用語言的能力，增強學生的環(huán)保意識。1. ( 到目前為止，污染危害地球的方式已基本介紹完畢，可以讓學生做專題討論，以鍛煉他們組織語言的綜合能力。在此過程中，鼓勵學生大膽發(fā)揮，做最大程度的拓展性討論。最后通過匯報，教師檢驗活動成果。)t: ok, until now, we have learned so many kinds of pollution. now please work in groups and discuss them. after a moment, i ll ask some students to report it.2. homework:write an article about the pollution.板書設計：all these problems are very serious.section cmillions ofwhen it rain