Unit5Lesson28課件英語冀教版九年級(jí)全冊

Unit5Lesson28TheStudyofLivingThings1.學(xué)習(xí)目標(biāo)3.重點(diǎn)探究2.自主學(xué)習(xí)學(xué)習(xí)導(dǎo)航5.當(dāng)堂檢測6.課堂總結(jié)4.拓展提升

新課導(dǎo)入Butterfliesarebeautiful,whatdoyouknowaboutthem?學(xué)習(xí)目標(biāo)1.掌握單詞：biology,butterfly,migrating,fantastic,grandchildren,female,chemical掌握短語：drawone’sattention,returnto…,asmanyas,layeggs2.了解并掌握定語從句的基本知識(shí)點(diǎn)3.了解關(guān)于大自然生物的知識(shí)自主學(xué)習(xí)biologybutterflymigratefantasticcompletelygrandchildfemalemilkweedchemicalpuzzling

n.

生物學(xué)；生物n.蝴蝶v.

移居；遷徙adj.

奇異的；了不起的;極好的adv.完全地n.孫子；孫女；外孫；外孫女n.雌性的動(dòng)物或植物；女子n.（植）馬利筋n.化學(xué)物質(zhì)adj.令人費(fèi)解的重點(diǎn)探究

Dr.ChipTaylorteachesbiologyatauniversityintheUnitedStates.HestudiesonekindofNorthAmericanbutterfly.Justlikeamigratingbird,thisbutterflytravelsabout4000kilometressouthinfall.FantasticfactsaboutthebutterflyhavebeendrawingDr.Taylor’sattention.InMexico,thebutterfliesalwaysreturntothesamesmallpieceofforest,whichisonly20kilometreswide.Here,asmanyas230millionbutterfliesspendthewinter.Theycancoversometreesalmostcompletely.Thebutterfliesthatreturntothesoutharethegreat-greatgrandchildrenofthebutterfliesthatleftforthenorth.Whentheybegintotravelnorthinspring,thefemaleslayeggs.Theylayeggsononlyoneplant:milkweed.

ButinMexico,peoplecutdownthetreesthatthebutterfliesneedtorestonbeacausetheywantmorelandforfarming.IntheUnitedStatesandCanada,farmersusechemicalsthatkillmilkweed.ThisworriesDr.Tayoralot.Nowthingsareimproving.Mexicohasbeguntoprotectpartsofitsforests.TheUnitedStatesandCanadahaveencouragedfarmerstouselesschemicals.Scientistsstilldon’tunderstandhowthebutterfliesknowwhentoflysouth.Iftheyareevenafewdayslate,

theywillfreeze.

Andhowdoallthegreat-greatgrandchildrenfindthesameforestinMexicoeveryyear?Thisisbothpuzzlingandinterestingformanyscientists.Therearemanymysteriesyettobediscoveredbythoseinterestedinscience.Wouldyouliketostudybiology?1Readthelessonandcompletethetable.FantasticfactsaboutbutterfliesThebutterfliesalways________tothesamesmallpieceofforestand_________thewinterthere.Thebutterfliesthatreturntothesoutharethegreat-greatgrandchildrenofthebutterfliesthatleftforthenorth.Thefemales_______eggsononlyoneplant:milkweed.ThingsthatDr.taylorworriesaboutInMexico,peoplecutdownthetreesthatthebutterfliesneedto______on.IntheU.S.andCanada,farmersusechemicalsthat______milkweed.Thingsthatscientistscan’tunderstandHowdothebutterfliesknowwhentoflysouth?Howdothegreat—greatgrandchildrenofthebutterflies______thesameforest?returnspendlayrestkillfindLet'sDoIt!Attributiveclause1)who,whom,thatIshethemanwho/thatwantstoseeyou?(who/that在從句中作主語)Heisthemanwhom/thatIsawyesterday.(whom/that在從句中作賓語)Attributiveclause2)whose用來指人或物，(只用作定語,若指物，它還可以同ofwhich互換)Theyrushedovertohelpthemanwhosecarhadbrokendown.Pleasepassmethebookwhose

coverisgreen.Attributiveclause3)which,that它們所代替的先行詞是事物的名詞或代詞，在從句中可作主語、賓語等Aprosperitywhich/thathadneverbeenseenbeforeappearsinthecountryside.(which/that在從句中作主語)Thepackagewhich/thatyouarecarryingisabouttocomeunwrapped.(which/that在從句中作賓語)Example:Wedidsomeexperimentsyesterday.Theexperimentswerefantastic.Theexperimentsthatwedidyesterdaywerefantastic.1.Iaskedhimtomailtheletter.Iwrotethelettertomycousin.Iaskedhimtomailtheletterthat/which/不填

Iwrotetomycousin.2.YesterdayImetaboy.Theboyisanewmemberinourartclub.YesterdayImetaboywho/thatisanewmemberinourartclub.3.Marywascarryingabag.Thebagcostheralotofmoney.

Marywascarryingabagthat/whichcostheralotofmoney.4.Footballisateamsport.Footballispopularallovertheworld.

Footballisateamsportthat/whichispopularallovertheworld.Let'sDoIt!2Jointhesentencetomakeattributiveclauses.

Tasktips:Eachgroupshouldpreparesomepiecesofpaperanddividethemintothreecolumns.StudentAwritesaperson'snameinthefirstcolumn,foldsthepaperandpassesittoStudentB.StudentBwritesastatementbeginingwith“who",foldsthepaperandpassesittoStudentC.StudentCmustfinishthesentenceandreaditoutloud.Example:3Workingroupsofthreetoplayagame.Mr.BrownwhoisabiologistwillgiveusatalkABCLet'sDoIt!拓展提升1.FantasticfactsaboutthebutterflyhavebeendrawingDr.taylor'sattention.drawingone'sattention意為“引起某人的注意”，與callone'sattention同義。此處attention用作不可數(shù)名詞，意為“注意，留心”。e.g.Thefactsdrewsomepeople'sattention.

2.Here,asmanyas230millonbutterfliesspendthewinter.asmanyas意為“多達(dá)......”e.g.Therearemanyas3000asstudentsinourschool.否定形式：notas/so...as...3.Here,asmanyas230millionbutterfliesspendthewinter.e.g.Well,Ispendalotoftimewatchingmovies.spend:度過，花(錢/時(shí)間)過去式和過去分詞都是spent。相關(guān)短語：spendtime/money(in)doingsth.spendtime/moneyonsth.spendtimewithsb.4.Theexperimentsthatwedidyesterdaywerefantastic.that引導(dǎo)定語從句,關(guān)系代詞that代替先行詞experiments在定語從句中作did的賓語,可省略。此時(shí),也可使用關(guān)系代詞which。【拓展】在下列情況下,關(guān)系代詞只能使用that而不能使用which:不定代詞作先行詞時(shí);先行詞前有序數(shù)詞或形容詞的最高級(jí)時(shí);先行詞中既有人也有物時(shí);先行詞前有theonly,just,next等詞修飾時(shí);當(dāng)主句是who/which開頭的特殊疑問句時(shí)。當(dāng)堂檢測1.Dr.ChipTayloris____________(biology).2.Thiscrossword___________(puzzling)ishardtodo.3.Mymothertooksome____________(freeze)meatfromthefridge.4.Hehas___________(complete)forgottentheplace.5.Myblackhen________(lay)aneggyesterday.frozen一、用括號(hào)中所給詞語的適當(dāng)形式填空。biologist