Unit 5 SectionB Using Language 课件-2022-2023学年高中英语外研版2019选择性必修第一册

Unit5RevealingnatureSectionBUsingLanguagePre-class1.

inone'sownwords____________________2.doresearch_______________在……方面进行研究3.intheend____________________4.

makeimportantdiscoveries____________________5.

declareextinct____________________6.

beblamed________sb.归咎于某人用某人自己的话（来说）on终于，最后做出重大发现宣布灭绝on7.live_________isolation生活在与世隔绝的环境中8.thepopulation____________________人口数量下降9.____________________对……有害10.immunesystems____________________11.fight_________击退；抵抗12.

That's_____________!

=That'sunbelievable!

令人难以置信！indeclinedbeharmfulto免疫系统

offincredibleActivity1aDarwinsuspectedthatthefincheshadevolvedfromacommonancestorbManypeoplerefusedtobelievethatlivingthings,includinghumans,hadevolvedfromlowerformsoflife.1Insentence(a),whichactionhappenedfirst,"suspected"or"evolvedfromacommonancestor"?Insentence(a),"evolvedfromacommonancestor"happenedfirst.2Insentence(b),whichactionhappenedfirst,"refusedtobelieve"or"evolvedfromlowerformsoflife"?Insentence(b),"evolvedfromlowerformsoflife"happenedfirst.03Whatdoesthestructurehaddoneindicate?Itindicatestheactionhappenedbeforeacertainpastaction.While-class过去完成时过去完成时是很重要的动词的时态，也是学生在使用中常常出错的语法项目，教师应引导学生在了解其基本概念和用法的基础之上，深刻理解“过去的过去”的含义，并在活动中加以体会，最终掌握并灵活运用。0过去完成时的基本用法：1）表示在过去的某一时间或某一动作之前完成的动作或存在的状态，即“过去的过去”。例如：a.Beforewegottothetrainstation,thetrainhadalreadyleft.我们到达火车站之前，火车就已经离开了。b.BeforeIcouldsay"thankyou",hehadrunaway.我还没来得及说谢谢，他就跑开了。2）表示从过去某一时间开始，一直延续到过去的另一个时间的动作，常用的时间状语有bythen,bytheendof,bythetime。例如：a.Bytheendoflastterm,wehadlearnt2,000Englishwords.到上学期期末为止，我们已经学习了2,000个英语单词了。b.Theyhadlivedtherefortenyearsbythen.到那时为止，他们已经在那里住了10年了。3）表示愿望、打算等的动词，如hope,want,expect,think,mean,suppose,intend,plan等后接从句时,一般用过去完成时表示本打算实现而未实现的愿望和计划。例如：Ihadintendedtomeethimattheairport,butIhadanimportantmeetingtoattend.我本打算去机场接他，但是我有个重要的会议要参加。b.IhadhopedtotakeaholidaythisyearbutIwasnotabletogetaway.我原打算今年去度假，可是我离不开。4）在句型hardly…when和nosooner…than中，主句用过去完成时，从句用一般过去时，表示“一……就……”。例如：a.HardlyhadIleftwhenitbegantorain.我刚离开就开始下雨了。b.Nosoonerhadhesatdownthanthetelephonerang.他刚坐下，电话铃就响了。YuanLongpingwasborninBeijingin1930.Afterhegraduatedfromuniversityintheearly1950s,hededicatedhimselftotheresearchofagriculture.Yuanhadtheideatocreateanewbreedofriceinthe1960s.Sincethen,hehasworkedtirelesslytoresearchanddevelopabetterricebreed.In1973heandhiscollaboratorsmanagedtocultivateahybridricespeciesthatwassuperiortomanyothers.Thisspeciesproduced20percentmorericeperplantthanthecommonlygrownvarieties.Forhisachievementsandcontributions,Yuanisknownasthe"fatherofhybridrice"andwasawardedtheMedaloftheRepublicin2019.Activity2aNaturaldisastersledtofoodshortagesinthe1960s.bYuanLongpingbegantodoresearchonhybridrice.cYuanLongpingdevelopedabettertypeofrice.YuanLongping1______todoresearchonhybridricebecausenaturaldisasters2_____foodshortagesinthe1960s.Intheend,he3_____abettertypeofrice.beganhadledtodevelopedGregorMendel(1822–1884)wasaninfluentialbotanist.Mendelworkedoutthebasicprinciplesofhereditybyexperimentingwithplants.In1866,hepublishedhisfindings,showinghowinvisible"factors"(nowknownasgenes)areresponsibleforpredictablevisibletraits.Asaresultofhiswork,hebecameknownasthe"fatherofmoderngenetics".aGregorMendelchosetostudypeaplantsbecausetheircharacteristicswereeasytocontrol.bGregorMendelmadeimportantdiscoveriesaboutgenetics.cGregorMendeldiedin1884.GregorMendel4_____studypeaplantsbecausetheircharacteristicswereeasytocontrol.Bythetimeofhisdeathin1884,he5_____importantdiscoveriesaboutgenetics.chosetohadmadActivity3LonesomeGeorgewasthelastPintaIslandtortoise.Hediedin2012.AfterGeorge'sdeath,thePintaIslandtortoisewasdeclaredextinct.TheextinctionofthePintaIslandtortoiseisblamedonhumans.Beforehumans1_____ontheisland,thespecies2_____inisolationand3_____theplantsthatnaturallygrewthere.Georgewasdiscoveredmanyyearsaftertheirarrival,andbythenhumans4_____newspeciesthat_____5forthefoodthetortoisesate.Aftergoatsinparticularhadbeenbroughttotheisland,thePintaIslandtortoisepopulation6_____.Eventually,onlyGeorgeremained.arrivedhadlivedeatenhadintroducedcompeteddeclinedAfter-classIturnedontheTVassoonashe______(enter)theroom.2.

Heregrettedthemomenthe_______(say)this.3.

Wewererelievedtolearnthatalltheminers______(rescue)fromtheaccident.enteredhadsaidhadbeenrescued4.Thepo