（新人教版）高中英语必修三《Unit 4 Astronomythe science of the stars》精品.ppt

Unit4Astronomy thescienceofthestars Learningaboutlanguage Step1Revision Fillintheblanksaccordingtothereadingpassage Afterthe BigBang theearthwasjustacloudofenergeticdust Itexplodedloudlywithfireandrock whichwere toproducethewatervapour carbondioxideandothergases Thensmallplantsgrew They andfilledtheoceansandseaswithoxygen Manymillionsofyearslaterthefirstgreenplantsbegantoappearonland Whentheplantsgrewintoforests reptilesappearedforthefirsttime Intime multiplied Theyproducedyounggenerallyby eggs Whendinosaurs ontheearthformorethan140millionyearsanddisappeared mammalsbecamemoreimportant Nowsmallcleveranimalswithhandsandfeetappearedandspreadallovertheworld Astimegobytheycoveredtheearthandtheyareputtingtoomuchcarbondioxideintothe which heat escapingfromtheearthintospace Whetherlifewillcontinueonearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved laying existed atmosphere prevents from Step2wordsandexpressions 1 intime 原文再现 Theywereintimetoproducecarbon nitrogen watervapourandothergases whichweretomaketheearth satmosphere 句子分析 whichweretomaketheearth satmosphere是 成分 指代 归纳 intime来得及 总有一天 迟早例如 1 Iwasjustintimefortheflight 2 Iwillseehimintime 定语从句 carbon nitrogen watervapourandothergases 我正好赶上航班 我迟早会见到他 拓展 与time有关的短语innotime立即 立刻 atanytime在任何时候 atonetime曾经 一度 attimes有时 偶尔 ontime按时 准时 ofthetime现在的 当时的 即学活用 1 Ifyoukeepon you llsucceed 93年全国卷I A intimeB atonetimeC atthesametimeD ontime 2 multiply 1 原文再现 Theymultipliedandfilledtheoceansandseaswithoxygen whichencouragedthelatershellfishandallsortsoffish 2 Usingthismethod you llfindtheefficiencyismultipliedseveraltimes 3 7multipliedby8is56 归纳 multiply的含义是 1 2 3 即学活用 9 3 andtheproductis27 繁殖 增多 增加 相乘 multiply by 3 lay 原文再现 Theyproducedyounggenerallybylayingeggs 拓展 1 放 置layitonthetable 2 摆放好tolaythetable 3 产 下 蛋 Thehenlaidthreeeggs 辨析 即学活用 They us forthreemonths A Laidoff B laiddown C laidon D laidout 解雇 放下 安装 设计 花费 4 exist 1 原文再现 Theylaideggstooandexistedontheearthformorethan140millionyears 2 Thelaid offworkersmainlyexistonbreadandtea 3 ThiskindoftreesonlyexistsinChina 归纳 1 exist onsth 生存 活下来 幸存 靠 为生2 existinsth存在于 之中3 existencen 存在 生活 即学活用 Peopledonotnowbelieveinthe ofghosts A birthB evidenceC existenceD occurrence 5 atmosphere 1 原文再现 theyareputtingtoomuchcarbondioxideintotheatmosphere 2 Theatmospherechangedassoonasshewalkedin 归纳 atmosphere为名词 其含义1 2 其形容词atmospheric tm s fer k adj 大气的e g atmosphericpressure大气压力 即学活用 Thetopleadersofthetwocountriesareholdingtalksinafriendly 22湖北08 A atmosphereB stateC situationD phenomenon 大气 气氛 6 prevent from 原文再现 whichpreventheatfromescapingfromtheearthintospace 注意 prevent后面跟名词和代词作宾语 在宾语后可跟fromdoing from可以省略 因此preventsb from doing和preventsb sb doing都可以 辨析 prevent from stop from keep from三者意思相近 常可互换 prevent from和stop from用于主动语态时from可以省略 但用于被动语态时不可省略 keep from中的from不能省略 即学活用 Nobodycanstopme thetennismatchonmyradio A tolistenB listeningC listentoD listeningto Step3DiscoveringusefulwordsandexpressionsDealwith Discoveringusefulwordsandexpressions ofthetextbook Answersto Discoveringusefulwordsandexpressions Ex 1 EX 2 C A C B EX 3 1 fundamental 2 astronomy 3 givesbirthto 4 existed 5 asaresult 6 atoms 7 prevents from 8 puzzle EX 4 Emotionalwords 1 violent 2 angry 3 rude 4 Shocked5 Excited 6 crazy Step4Discoveringusefulstructures Nounclausesasthesubject 1 studytherule 1 Whatpartdoestheunderlinedpartserveasineachsentenceofgroup1 1 Atreehasfallenacrosstheroad 2 Youareastudent 3 Tofindyourwaycanbeaproblem 4 Smokingisbadforyou Theunderlinedpartservesas Subject Whatpartdoestheunderlinedpartserveasineachsentenceofgroup2 1 Howdoyoudo isagreeting 2 Whatshesaidisnotyetknown 3 Thatweshallbelateiscertain 4 Itiscertainthatweshallbelate Wecanseefromthesesentencesthatasentenceservesas sowecallit Subject SubjectClause 2 Sentences makingpractice Itiscertain Wewillbelate that e g Itiscertainthatwewillbelate Isshecomingornot Wedon tknow whether Whatdoeshewanttotellus Wedon tknow what Whenwillyoucomeback Itdoesn tmatter when Wedon tknowwhethersheiscomingornot Wedon tknowwhathewantstotellus Whenyouwillcomebackdoesn tmatter 2 Findtherule 1 在句子中起名词作用的句子叫 名词性从句的功能相当于名词词组 在复合句中担任主语时就叫 2 名词性从句的连接词可以分为三类 连接词that whether 连接代词who whoever what whatever 和which 连接副词when whenever where how和why 名词性从句 主语从句 3 有时为了使句子结构平衡 避免 头重脚轻 常用it作形式主语 而把从句放在后面 例如 Itisapitythatshehasmadesuchamistake 4 用于Itisimportant natural necessary impossiblethat 句型中 主语从句应使用虚拟语气 谓语动词用 should 动词原形 的形式 should有时有感情色彩 5 两点注意 1 主语从句放句首时 必须有连接词引导 不能省略 如果it作形式主语 而把主语从句放句末时 从属连词that可以省略 2 主语从句放句首 不能用if引导 3 Applytherule multiplechoices1 isknowntousallisthatthe2008OlympicGameswilltakeplaceinBeijing 福建卷 A ItB WhatC AsD Which 2 wasmostimportanttoher shetoldme washerfamily 山东卷 ItB ThisC WhatD As Step5当堂小练一 FinishthemultiplechoicesWecan tcontinuetopretendthattheproblemofhomelessnessdoesn t inthiscity A existB liveC beD survive2 HewantstoseechangesinthecompanyandIamsurehewill A ontimeB atatimeC atonetimeD intime3 anyoneshouldwanttokillherwasunbelievable A WhetherB ThatC WhatD If 4 Theyhaveputthebirdinacageto itfromflyingaway A avoidB preventC letD resist5 兔子繁殖得很快 multiply 6 一只躺在树下的公鸡撒谎说它生了一个蛋 Rabbitsmultiplyrapidly Acocklyingunderthetreeliedtolayanegg 二 Completethefollowingpassagewithwordsandphrasesbelowinthecorrectform Isthemoonaplanet Debatesaboutthisquestion sinceitappeared Somescientistslivinginthe thinkthattheearthgivesbirthtothemoonbecausethemooncirclesourplanet Othersbelievethatthemoon beforetheearthwasformed multiplied atmosphere existed Theythinkthatearlierintimeittravelledthroughspaceasasmallplanetwhichwascaughtbytheearth sgravity Asaresult itgoesaroundourplanet Thesescientists theevidenceforthistheory thefactthattheatomsthatmakeuptherocksonthemoonseemtobediffer