选修六Unit4 global warming Learning about language修改课件.ppt

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1、Book6Unit4DiscoveringusefulwordsandexpressionsDiscoveringusefulwordsandexpressions(P28)Gooverthenewwordsandphrasesintheprevioussections.Thencompleteeachsentencewithoneofthosenewwordsorphrases.21.CharlesKeelingcollected______onthecarbondioxidecontentintheatmosphereover

2、aforty-yearperiod.Hefoundthattheamountofcarbondioxide_______increasingduringthattime.datakepton2.Althoughweareburningcoalinhuge_________everyyear,wewon’t________ofitforcenturies.3.Iftheamountofgreenhousegasescontinuesto_______,wecouldbefacingaglobal__________.quantiti

3、esrunoutbuildupcatastrophe4.Manyscientistsbelievethatglobalwarminghas__________throughtheburningoffossilfuels.comeabout5.The_____________ofarisingsealevelwouldbewidespreadflooding.consequence6.Onthewholethewarmingoftheearthisa____________thatcausesgreatconcern.7.The__

4、________showstemperaturechangesduringthe20thcentury.8.Onehectareofforestcanabsorb23tonsofcarbondioxide____year.phenomenongraphper9.Thewashingmachineusestoomuchenergy,but_________webuyamoreeconomicalone,itwouldstillusetoomuchwater.10.Thecaraccidentonthemainroadyesterda

5、y___________onedriver’sdeath.evenifresultedin由it引导的强调句结构：(1)肯定句Itis(was)+被强调部分+that(who)+句子其他部分(2)否定句：It+is（was）+not+被强调的部分+that(who)+句子的其它部分.注意：此结构用来强调原句子中的主语、宾语、状语、宾语补足语和间接宾语。强调的成分可以是一个词，一个短语，也可以是一个从句。(1).强调句型的时态要以原句的时态为依据。原句用现在时，强调句用is；若原句为过去时，强调句中则要用was。例如：Imethim

6、inthestreetyesterday.（原句）→ItwashimthatImetinthestreetyesterday.（强调宾语him，原句met为过去时，强调句也用过去时was。）(2).要注意主谓一致性。例如：It’swewhoaretoanswerforit.It’sI,notmyparents,thatamwaitingforthebus.(3).强调时间、地点状语时不得用when和there取代that，也应避免使用which。(4).被强调的是疑问句，改为强调句后仍用疑问句结构。例：一般疑问句：Is/Was+i

7、t+被强调的部分+that+句子其它部分特殊疑问句：①特殊疑问词+②is/was+③it+④that+句子的其它部分?Whatdoyouwantmetodo?→Whatisitthatyouwantmetodo?(5).被强调的如果是not…until;because；onlyafter等状语从句时，习惯上用”Itis/wasnotuntil…that…”;“Itis(was)because…that…”,“Itwasonlyafter…that…”结构。例如：Itwasnotuntil1920regularradiobroadc

8、astsbegan.(NMET’95)A.whileB.whichC.thatD.sinceC(6).注意强调句型与其它句型的区别：强调句型和定语从句的区别主要从以下两方面考虑：1).强调句式“Itis(was)…that/who”可去掉，不影响句