1.學生自學生詞，并記住單詞拼寫和拼讀。2.預習課本，找出重點短語和句式。3.讀、記后完成學案中自學導練作業(yè)。Step1情景導入Theteachershowaphotoofpollutedriver.T:Whatcanyouseeinthephoto?S1:Icanseepollutedwater.S2:Icanseeadeadriver.Therearenoplants,nofishorlivingthings.T:Pollutionisveryserious.Pollutionisadangertoourhealth.Wemustdosomethingtosaveourearth.S2：Whatcanwedoforit？T:Wecancollectwastepaperorrubbishwhichcanberecycledorusedagain.Wecanalsoturnofflightstosaveenergywhenwedon\'tusethem…Ss:That\'seasy.Wewilldothem.Step2完成教材Activities1~3的任務(wù)1.Workinpairs.Lookatthepicturesandtalkaboutthem.Usethewordsintheboxtohelpyou.(Activity1)(1)處理生詞。教師可以領(lǐng)讀方框中的詞，并讓學生試著用這些單詞描述圖片。(2)學生活動：學生利用已有詞匯和方框中的單詞描述圖片，然后教師引導學生自由發(fā)揮，談?wù)撚嘘P(guān)污染的問題。教師可以通過提問引導學生用相關(guān)詞匯問答問題例如：Whatmaycausepollution?Howdomanyofthefactoriespollutetheairandrivers?(3)教師請學生展示。2.Listenandcompletethesentences.(Activity2)(1)學生個體活動，聽錄音，補全句子。(2)全班核對答案。（答案:1.pollution2.rules3.recycle;glass)3.Listenandread.Nowcompletethenotes.(Activity3）(1)教師給出一兩個簡單的問題，例如：WhyisLinglingworriedaboutthefuture?Whyispollutionadangertoourhealth?Whatdoyouthinkmaycausepollution?(2)學生合上書，聽錄音。回答問題。(3)學生再次聽錄音，要求學生能獲取對話中的細節(jié)信息，完成活動3中的練習。(4)學生兩人一組或小組活動，核對答案。(答案:1.farmerscan\'tusethewaterfortheircrops2.spreadsovercitiesandvillages3.usesomuchoilandcausepollution4.collectswaste;recycledorusedagain;sellsthewaste;inpoorareas5.waystosaveenergyandrecycleathome;lesswaste)(5)學生打開書，跟讀或朗讀對話。環(huán)節(jié)說明:本活動呈現(xiàn)新的語言內(nèi)容,訓練學生聽懂主旨大意和獲取細節(jié)信息的能力。Step3小結(jié)訓練1.Polluted（被污染的）waterisadanger（危險）tothelivingthings.2.Wemustsaveenergy(節(jié)約能源）andcauseless(引起少些）pollution.Step4問題探究如果每個人與污染做斗爭，地球?qū)⒈煌炀取feveryonefightspollution,the