人教選修6Unit4GlobalWarmingGrammarTeachingmaterialNSEFCBook6Unit4TeachingaimsEnablethestudentstomastertheusageoftheformitis/was...thatTeachingimportantpointsHowtoenablethestudentstoknowthestructureandtheusageoftheformitis/was...thatTeachingdifficultpointsHowtohelpthestudentstomastertheusageoftheformitis/was...thatTeachingaidstaperecorder,slidesTeachingproceduresSteplRevisionT:Firstlet'scheckanswers.(slideshow)Discoveringusefulwordsandexpressions.(P28)CharlesKeelingcollectedonthecarbondioxidecontentintheatmosphereoveraforty-yearperiod.Hefoundthattheamountofcarbondioxideincreasingduringthattime.Althoughweareburningcoalinhugeeveryyear,wewon't_ofitforcenturies.Iftheamountofgreenhousegasescontinuestowecouldbefacingaglobal.Manyscientistsbelievethatglobalwarminghasthroughtheburningoffossilfuels.Theydonotthinkthatignoringtheissueisworththe.describesweatherconditionsoveraperiodofyearsinaparticularplace.Theofarisingsealevelwouldbewidespreadflooding.TheuseofenergyinSusanna'scountryislowtheuseofenergyintheUSA.Thewarmingoftheearthisathatcausesgreatconcern.Theshowstemperaturechangesduringthe20thcentury.Onehectareofforestcanabsorb23tonsofcarbondioxideyear.Keys：1.datakepton2.quantities;runout3.buildup;catastrophecomeabout;risk5.Cparedto8.phenomenon9.graph10.perAnswerkeysforEx.2onPage28:Thefirstgraphshowstheglobalbetweenand_Thetemperatureanddecreasedoverthisperiodbutonthewholeit__byaroundanditshighestin2000.Therewasasteadyinthetemperatureduringthetwentyyearsafter1980.Wecanseefromthegraphthattheearthhasbecomesinceearlylastcentury.Thesecondgraphshowstheamountofintheatmospherefromto.Thecarbondioxidesteadilyoverthisforty-yearperiod.Itwentupfrom315to370partsmillion.Keys：Temperature；1860；2000；increased；rose；1910；increase/rise；warmercarbondioxide；1957；1997；increase/wentup；perStep2Grammar強(qiáng)調(diào)句結(jié)構(gòu)?？嫉膹?qiáng)調(diào)句結(jié)構(gòu)是it引導(dǎo)的句子。一、Itis（was）被強(qiáng)調(diào)部分+that（who）+句子其他部分。此結(jié)構(gòu)強(qiáng)調(diào)的成分僅限于主語，賓語和狀語。Itisfromthesunthatwegetlightandheat.ItwasnotuntilIhadreadyourletterthatIunderstoodthetruestateofaffairs.KarlboughtMarvaabicycleonherbirthday.卡爾在瑪瓦生日那天給她買了一輛自行車。ItwasKarlthat/whoboughtMarvaabicycleonherbirthday.（強(qiáng)調(diào)主語）ItwasMarvaforwhomKarlboughtabicycleonherbirthday.（強(qiáng)調(diào)間接賓語）ItwasabicyclethatKarlboughtMarvaonherbirthday.（強(qiáng)調(diào)直接賓語）注意區(qū)別強(qiáng)調(diào)句中的that/who分句與定語從句：Itwasthestudentthat/whoaskedthesillyquestion.是一個(gè)學(xué)生問了這么一個(gè)愚蠢的問題。（分裂句）Hewasthestudentwhoaskedthesillyquestion.他就是問了這么一個(gè)愚蠢問題的學(xué)生。（劃線部分是定語從句）二、not...until...的強(qiáng)調(diào)形式：Itisnotuntil+被強(qiáng)調(diào)部分+that...“直到…才…”，主要用于強(qiáng)調(diào)時(shí)間狀語的強(qiáng)調(diào)句型。WedidnotbeginstudyingFrenchuntilweentereduniversity.我們進(jìn)了大學(xué)才開始學(xué)法語。要強(qiáng)調(diào)untilweentereduniversity，就成了：ItwasnotuntilweentereduniversitythatwebeganstudyingFrench.the18thcenturythatmanrealizedthatthewholeofthebrainwasinvolvedintheworkingsofthemind.A.DuringB.InC.ItwasuntilD.ItwasnotuntilD對(duì)。直到十八世紀(jì)，人們才意識(shí)到：心理活動(dòng)與整個(gè)大腦有關(guān)。三、強(qiáng)調(diào)句的疑問句句型1?強(qiáng)調(diào)句的一般疑問句句型：Is/Was+it+所強(qiáng)調(diào)的部分+that/who/whom+其它？2.強(qiáng)調(diào)句的特殊疑問句句型：特殊疑問詞+is/wasitthat/who/whom+其它？Whyisitthatyouhatewinter?你究竟為什么不喜歡冬天？Howwasitthatyoumissedsuchawonderfullecture?你怎么會(huì)錯(cuò)過這么精彩的報(bào)告？Whenwasitthattheywentabroad?他們什么時(shí)候出國(guó)的？四、判斷強(qiáng)調(diào)句的方法判斷是否是強(qiáng)調(diào)句是，可把Itis/was…that去掉，剩余部分在不增減任何詞的情況下還是一個(gè)完整的句子，那么這種句子是強(qiáng)調(diào)句。ItwasinthestreetthatImetherfather.finthestreetImetherfather.Itwasbecauseshewasillthattheydidn'taskhertodothejob.fBecauseshewasill,theydidn'taskhertodothejob.Step3Exercises一、根據(jù)劃線部分把下列句子變成強(qiáng)調(diào)句。Peterlentusthemoney.Theywantmoney.AllthishappenedonMonday.Ididn'thearformheruntillastsummer.WhydoeseveryonethinkIamnarrow-minded?Keys：ItwasPeterwholentusthemoney.Itismoneythattheywant.ItwasonMondaythatallthishappened.ItwasnotuntillastsummerthatIheardfromher.WhyisitthateveryonethinksIamnarrow-minded?二、MultiplechoicesItwasinthisvillageIwasbroughtup.A.whereB.thatC.onwhichD.whichIsitthefactorythistypeofcarsareproduced?A.whichB.whereC.thatD./Itwastheoldworkercamethatwetheexperiment.A.until;didn'tbeginB.notuntil;beganC.untilbeganD.notuntil;didn'tbeginC.untilbeganItwasinthelab___wastakenchargeofbyMr.Harristheydidtheexperiment.A.which,thatB.that,whichC.that,whomD.which,whereItwashedidfrightenedme.A.what,thatB.th