Unit5 Using Language 名師教學(xué)設(shè)計(jì)

4/4Unit5UsingLanguage名師教學(xué)設(shè)計(jì)課時(shí)內(nèi)容本課時(shí)涉及的是語(yǔ)言知識(shí)運(yùn)用，包括Itasanemptyobject和Ecosystems兩部分。Itasanemptyobject講解it作形式賓語(yǔ)的句型和基本用法，要學(xué)會(huì)分析句子結(jié)構(gòu)，選用正確的賓語(yǔ)形式。Ecosystems首先以思維導(dǎo)圖的形式列出了食物鏈，分別說(shuō)明了食物鏈中的生產(chǎn)者、初級(jí)消費(fèi)者、次級(jí)消費(fèi)者以及分解者在食物鏈中所處的地位和作用；然后以聽力練習(xí)的形式介紹了蜜蜂數(shù)量的減少對(duì)于整個(gè)生態(tài)系統(tǒng)的潛在影響。課時(shí)目標(biāo)1.掌握本課時(shí)的重點(diǎn)單詞dissolve、nutrient、worm和短語(yǔ)benativeto、dueto、relyon、feedon、preyon、breakdown、takein、beinexistence、dependon、beresponsiblefor、contributeto的用法，并能在真實(shí)語(yǔ)境中靈活運(yùn)用。2.掌握it作形式賓語(yǔ)的用法。3.引導(dǎo)學(xué)生關(guān)注話題的語(yǔ)用功能，學(xué)會(huì)表達(dá)質(zhì)疑和回應(yīng)別人的質(zhì)疑。4.了解食物鏈中生物的相互制約、相互依存，共生共榮及生態(tài)平衡的重要性。人類可以通過(guò)自己的努力保護(hù)各個(gè)生態(tài)系統(tǒng)，促進(jìn)生態(tài)平衡；人類也能夠?yàn)榱俗陨淼难矍袄媛訆Z資源，破壞生態(tài)平衡。人類不能超自然而存在，保護(hù)生態(tài)平衡也是保護(hù)人類自己，一旦生態(tài)平衡遭到破壞，危及整個(gè)生物圈，人類自身也在劫難逃。重點(diǎn)難點(diǎn)：重點(diǎn)：it作形式賓語(yǔ)的用法。難點(diǎn)：1.it作形式賓語(yǔ)的用法。2.食物鏈?zhǔn)顾械纳锉３种耙晃镏我晃铩钡臓顟B(tài)，只要沒有外界的破壞，食物鏈就永遠(yuǎn)不會(huì)斷，生態(tài)因食物鏈的存在而得到平衡。教學(xué)準(zhǔn)備：教師準(zhǔn)備：1.做好該部分內(nèi)容的PPT和音頻材料。2.準(zhǔn)備好有關(guān)生態(tài)平衡和食物鏈的材料。學(xué)生準(zhǔn)備：1.簡(jiǎn)述一個(gè)比較常見的食物鏈并分析各種生物相互依存、相互影響的關(guān)系。2.上網(wǎng)查找it作形式賓語(yǔ)的用法，學(xué)會(huì)分析句子結(jié)構(gòu)，選用正確的賓語(yǔ)形式。3.預(yù)習(xí)課本P53~55的內(nèi)容，我找出該部分的新詞匯，并根據(jù)上下文猜測(cè)其含義。教學(xué)過(guò)程：StepⅠGrammar1.DoActivity1onPage53.(1)Lookatthesentencesandanswerthequestions.Sentences(a)and(c)arefromthereadingpassage.aNovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.bNovisitorwouldthinkthattheislandbeingaUNESCOWorldHeritageSiteissurprising.cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.·Whatdoes"it"refertoinsentences(a)and(c)?·Whatisthedifferencebetweenthesentencesineachgroup?Suggestedanswers：·"It"insentence(a)refersto"theislandisaUNESCOWorldHeritageSite"."It"insentence(c)refersto"tocomeupwithaplantoremovealltherabbitsfromtheisland".·Whentheobjectofasentenceisathat-clause(b)oraninfinitive(d),wesometimesuse"it"asanemptyobjectandputtherealobjectlatertokeepbalance.Forexample,sentence(a)uses"it"astheemptyobjectof"think",referringtotherealobject:"theislandisaUNESCOWorldHeritageSite".Sentence(b)usesthat-clauseastheobjectof"think".（2）Giveenoughexamplesoftheusagesofitasanemptyobject.Andinstructstudentstosumuptheusagesofitasanemptyobject.Thenaskstudentstogiveexample.【設(shè)計(jì)意圖】從前面的閱讀文章中選取學(xué)生熟悉的句子并總結(jié)it作形式賓語(yǔ)的用法，旨在引導(dǎo)學(xué)生初步感知并了解it作形式賓語(yǔ)的用法。2.DoActivity2onPage53.Rewritetheunderlinedpartsusingitasanemptyobject.Thered-earedslider,aspeciesoffreshwaterturtle,isnativetotheSouthernUnitedStatesandNorthernMexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.Thesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant,andanyoneunabletokeeptheirpetsshouldtakethemtoanappropriateanimalshelter.Suggestedanswers：·manypeoplethinkitagoodideatokeepthisturtleasapet·believeitnobigissuetoreleasethemintothewild·peoplehavefounditathreattootherspeciestoreleasetheseturtlesintothewild·Expertsconsideritimportantforownerstokeeptheirpetsinanenclosedarea【設(shè)計(jì)意圖】通過(guò)改寫句子活動(dòng)，引導(dǎo)學(xué)生找出句子的真正賓語(yǔ)，了解it作形式賓語(yǔ)的用法和作用，并學(xué)會(huì)在具體語(yǔ)境中靈活運(yùn)用。3.DoActivity3onPage53.LookatthepicturesoftheSaihanbaNationalForestParkanddescribeitschangesusingitasanemptyobjectwhereappropriate.Youmayrefertothewordsandexpressionsinthetableforhelp.nouns/adjectivestodo/thatbreakthroughimpossiblelikelyunrealisticgrowinvestigateplanttreestransform【設(shè)計(jì)意圖】通過(guò)看圖描述圖片，并根據(jù)給出的語(yǔ)言提示，學(xué)會(huì)運(yùn)用it作形式賓語(yǔ)的句型，讓學(xué)生進(jìn)一步體會(huì)該語(yǔ)法在表達(dá)中的運(yùn)用，掌握it作形式賓語(yǔ)的用法。4.DoActivity4onPage53.Describehowaplaceyouknowhaschangedusingitasanemptyobjectwhereappropriate.【設(shè)計(jì)意圖】通過(guò)描述自己熟悉的某個(gè)地方在生態(tài)方面發(fā)生的變化，學(xué)會(huì)運(yùn)用it作形式賓語(yǔ)的句型，進(jìn)行語(yǔ)言練習(xí)，引導(dǎo)學(xué)生自己組織語(yǔ)言，加大了練習(xí)的難度，進(jìn)一步鍛煉學(xué)生運(yùn)用語(yǔ)言的能力?！緜渥ⅰ空Z(yǔ)法知識(shí)點(diǎn)講解詳見第二教案“重點(diǎn)語(yǔ)法精講”部分。StepⅡEcosystems1.DoActivity5onPage54.Lookatthediagramandanswerthequestions.Payattentiontothewordsandexpressionsinbold.·Whatdoesthediagramshow?·Whataretherelationshipsbetweenthelivingthings?Suggestedanswers：·Thediagramshowsafoodchain-theconnectionbetweenthelivingthings.·Thelivingthingsarecloselyconnectedwitheachotherbythefoodtheyeat.Secondaryconsumerspreyonprimaryconsumers,primaryconsumersfeedonproducers,andproducersabsorblightfromthesunandwateranddissolvednutrientsfromthesoil,whichareprovidedbydecomposers.(2)DoActivity6onPage54CompletethepassagewiththecorrectformofthewordsandexpressionsinActivity5.Inawoodlandecosystem,treesandotherplantsareproducers.They①__________water,andtakeinnutrientsfromthesoilandenergyfromthesun.Insectsareanexampleofaprimaryconsumer.They②____________heproducerstoprovidefoodforthem,andare③____________bysecondaryconsumers:smallmammalsandbirds.They④___________theprimaryconsumers.Worms,fungiandbacteriaaredecomposers.They⑤____________animalwasteandtheremainsoflivingthings.Thechemicalsthesedecomposers⑥__________fertilisethesoilandgivetheplantsthenutrientstheyneedtogrow.Suggestedanswers：①absorb②relyon③fedon④preyon⑤breakdown⑥r(nóng)elease【設(shè)計(jì)意圖】通過(guò)閱讀，了解整個(gè)生態(tài)系統(tǒng)的食物鏈中不同物種的位置和作用，并將黑體詞的適當(dāng)形式填入適當(dāng)?shù)奈恢茫岣邔W(xué)生分析問(wèn)題、解決問(wèn)題的能力，實(shí)現(xiàn)知識(shí)的遷移。StepⅢListenanddoexercises1.DoActivity7onPage55.(1)Askstudentstoread"DidYouKnow?"andmakesurestudentsunderstanditsmeaning.·Oneoftheoldestspeciesintheecosystem,thehoneybeehasbeeninexistenceformillionsofyears.·Ahoneybeecanflyasfastas24kilometresperhouranditswingscanbeat200timespersecond.·Injustonejourneytocollectpollenandnectar,onesinglehoneybeecanpollinateasmanyas50to100flowers.(2)Listentotheconversationandchoosethetruestatements.①Beesareveryimportanttoourfoodsupplybecausetheyprovidehoney.②Thebeepopulationisdeclining.③Withoutbees,humanswoulddieout.④Allhumancropsdependonbeesforpollination.⑤Ifbeesbecameextinct,otherinsectscouldpollinateenoughcrops.⑥Humansareresponsibleforthedeclineinthebeepopulation.Suggestedanswers：②③⑥2.DoActivity8onPage55.Listenagainandcompletetheflowchart.Acombinationofthingsdamagesbeehabitats,mainly①______________.Thebeepopulationis②____________.AccordingtostatisticsbeenumbersintheUS③___________injustoneyear.Withoutbees,cropswould④______________.⑤______________wouldnotbeabletocompensateforthelossofbees,because⑥______________ofthespeciesofcrops.Animalsthatliveonthecrops⑦_(dá)____________.Humanshavenothingtoeatanddieout.Suggestedanswers:①Pesticidesandclimatechange②decliningveryquickly③havefallenby17%④beunabletoreproduce⑤Otherinsects⑥beesareresponsibleforpollinatingabout70⑦woulddieout3.DoActivity9onPage55.Competetheboxeswiththeexpressionsfromtheconversation.●Youmustbekidding!●Idon'tbelieveit!●It'safact!●Don'tforgetthat...●Areyousureabout…?●Checkitoutforyourself…●IfAccordingtostatistics…ExpressingdoubtRespondingtodoubtSuggestedanswers:ExpressingdoubtYoumustbekidding!Idon'tbelieveit!Areyousureabout…RespondingtodoubtIt'safact!IDon'tforgetthat…Checkitoutforyourself…Accordingtostatistics…4.DoActivity10onPage55Talkaboutwhatwouldhappentotheecosystemifanotherspeciesdiedout.Usethewordsandexpressionsinthissection.【設(shè)計(jì)意圖】該部分設(shè)置了四個(gè)相應(yīng)的練習(xí)題，聽錄音，選擇正確的表述；再聽錄音，完成流程圖，難度有所增加；用所給的表達(dá)完成表格；討論如果一個(gè)物種滅絕會(huì)對(duì)生態(tài)系統(tǒng)產(chǎn)生什么樣的影響，在語(yǔ)言輸入的基礎(chǔ)上進(jìn)行語(yǔ)言輸出，讓學(xué)生學(xué)會(huì)表述，提高語(yǔ)言運(yùn)用能力。StepIVSummingup總結(jié)it作形式賓語(yǔ)的句型和用法，并注意該部分新學(xué)詞匯的運(yùn)用?！緜渥ⅰ空Z(yǔ)法知識(shí)點(diǎn)講解詳見第二教案“重點(diǎn)語(yǔ)法精講”。StepVHomework1.Givestudentssomeexamplestofillintheblankswithitasanemptyobject.2.Mastertheusagesofthenewvocabulary.板書設(shè)計(jì)：Unit5AdelicateworldPeriodIIUsinglanguageIGrammarNon-definingattributiveclauses1.DoActivity1onPage53.(1)Lookatthesentencesandanswerthequestions.(2)Giveenoughexamplesoftheusagesofitasanemptyobject.Guidestudentstosumuptheusagesofitasanemptyobject.2.DoActivity2onPage53.Rewritetheunderlinedpartsusingitasanemptyobject.3.Doactivity3onPage53.Look