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精品文档精品文档高中英语必修三第四单元重点、难点UnitFourAstronomy:thescienceofthestars1、Theywerefollowedintimebylandanimals.陆地动物及时出现。intime及时；终于Astitchintimesavesnine.小洞不补，大洞尺五。Youwillgetusedtoitintime.最终你会习惯的。易混辨析：intime和ontimeintime表示“及时；终于”；而ontime表示“按时”。联想扩展：innotime立即；马上atonetime曾经；一度atatime一次atanytime在任何时候attimes有时；偶尔fromtimetotime有时即时活用：–Howoftendoyougotoseeyourparents?---__________.A.InnotimeB.AfterawhileC.InashorttimeD.Fromtimetotime答案：D2、Theyproducedyounggenerallybylayingeggs.它们以产蛋的方式生产后代。layeggs下蛋Howmanyeggsdoesyouhenlayeveryweek?你的母鸡每周下多少蛋？联想扩展：laythetable摆桌子layup储存；搁置layover推迟laytheblameon责怪laythefoundation奠定基础layto归咎于layopen摊开；揭露layout摆开；展示layaside放在一边；积蓄laydown放下；放弃layfor等候3、Theseanimalsweredifferentfromalllifeformsinthepast,becausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.这些动物和以前的任何生物形式都不同，因为它们产仔并用奶水喂养它们。givebirthto…生产；产生Shegavebirthtoahealthybabylastnight.昨晚她生了一个健康的婴儿。Thatcenturygavebirthtomanygreatmen.那个世纪产生了许多伟人。4、Theseanimalsweredifferentfromalllifeformsinthepast,becausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.这些动物和以前的任何生物形式都不同，因为它们产仔并用奶水喂养它们。feedvt.用法归纳：（1）饲养IfIamlaid-off,Iwillfeedsomepigs.如果下岗，我就养猪。Doyoufeedanypetsathome?你在家养宠物吗？特别提示：feed作“饲养”讲时，等于raise和keep。（2）喂养Wefeedgrasstosheep.我们给羊喂草。Wefeedsheepwithgrass.我们用草喂羊。特别提示：注意feed当“喂养”讲时动物和饲料的前后顺序关系以及不同介词的用法。即时活用：1、He______alotofchicken______hisfarm.A.rises;inB.keeps;onC.raises;inD.supports;on2、–Ihaveaverybadcold.---Well,haveyoueverheardofasayingwhichgoes“_______acoldandstarveafever?”A.feedingB.tofeedC.fedD.feed答案：BD5、Finallyabout2.6millionyearsagosomesmallcleveranimals,nowwithhandsandfeet,appearedandspreadallovertheworld.最后大约在两百六十万年前，一些有手有脚的小型聪明动物出现了，并且扩散到世界各地。spreadv.用法归纳：（1）传播；传开（vi.）Badnewsspreadsquickly.坏消息传的很快。WordspreadthattherewasavariantvirusofH1N1.消息称H1N1病毒已经产生变异。（2）铺开；展开(vt.)Thebirdspreaditswingsandwasabouttofly.鸟伸开翅膀准备要飞。Shespreadanewsheetoverthebed.她给床上铺了一个新床单。（3）涂；抹(vt.)Pleasespreadthepaintevenly.把油漆抹均匀。It’sbetterforyoutospreadthehoneyonthebread.你最好把蜂蜜抹在面包上。（4）伸展；延伸（vi.）Xi’anisspreadingtothenorthandthewest.西安正在向北向西延伸。TheforestspreadsfromheretothefootofQinlingmountains.森林从这儿延伸到秦岭山脚下。联想扩展：spreadout伸开；散开；铺开spreadover覆盖一片；持续spreadwith在…上涂抹精品文档精品文档即时活用：Soonthenews________acrossthewholecountry,______thepeople.A.spread;excitingB.spread;excitedC.wasspread;excitedD.wasspread;exciting答案：A6、Thus,intheirturn,becomethemostimportantanimalsontheplanet.这样，轮到它们成为这个星球最重要的动物。inone’sturn轮到某人；接着Pleasegetonthebusinyourturn.该你上车了。联想扩展：ateveryturn事事；经常byturns轮流goforaturn散步；除去兜风ontheturn在变质outofturn不合时宜的takeaturn转弯taketurns轮流toaturn恰好7、Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.它们向大气层排放大量的二氧化碳，这阻止热量向外层空间释放。prevent…fromdoing防止/阻止…发生Wemustpreventthenewsfromspreading.我们应该阻止这个消息的传播。Nothingcanpreventhimfromgoingaway.什么也不能阻止他离开。特别提示：(1)这个句型中prevent还可以被stop或keep替代。(2)主动句中，prevent和stop后面的from可以省略，keep后的from不能省略；被动句中三个词后的from都不能省略。联想扩展：preventvt.防止；预防；阻止（1）跟名词或代词Manisfindingwaystopreventnaturaldisasters.人类正在寻找预防自然灾害的办法。VitaminCissupposedtopreventcolds.据认为维生素C能预防感冒。（2）跟动名词Teachersnowhavenowaystopreventstudents’listeningtoMP3inclass.老师们现在没办法阻止学生们上课听MP3。H1N1flupreventedhiscomingtoschool.甲流使他不能来上课。（3）preventionn.预防；防止（4）preventiveadj.预防性的即时活用：1、Weshoulddowhatwecanto______theChangjiangRiver______.A.stop;frompollutingB.keep;frombeingpollutedC.prevent;frompollutingD.keep;beingpolluting2、Nobodycanstopthenaughtyboy______.A.frompunishingB.beingpunishingC.frombeingpunishedD.tobepunished3、Theheavyrain______usstartingoutontime.A.keptB.preventedC.protectedD.wasstopped4、Itseemsverydifficult_________.A.tostopthechildtocryB.restrainingthechildtocryC.tokeepthechildfromcryingD.holdingthechild’scrying答案：BCBC8、Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.所以，在未来几百万年时间里生命能否在地球上延续取决与这个问题能否得到解决。dependvi.用法归纳：（1）依靠Westudentsaredependingonourparentsnow.我们学生现在在依靠父母。Thetowndependsentirelyupontourism.这个小镇主要依靠旅游。（2）依赖；指望Imainlydependedonhishelping,buthedidn’tturnup.我主要指望他帮忙，但是他没来。Therewasnobusnow,sowehadtodependonourlegs.现在没有班车了，我们只有指望双腿了。（3）由..决定;取决于Whetherwewillholdthesportsmeetingdependsontheweather.我们是否举行运动会取决于天气。Thepricedependsonthequality.价格取决于质量。特别提示：depend是不及物动词，后面一般要跟on或upon。联想扩展：It/That(all)depends.视情况而定即时活用：精品文档精品文档1、I’mplanningtoholdapartyintheopenair,butIcanmakenoguaranteesbecauseit_____theweather.A.linkswithB.dependsonC.connectstoD.decideson2、Themeaningofthewordisvarious_____differentsituation.A.dependsonB.dependingC.dependingonD.dependedon3、–WillyougowithustotheNationalPark?---Well,it_______.A.dependingB.dependsC.dependsonD.isdepended4、—HowwideistheYellowRiver?—That___fromwheretowhere.A.dependsB.changesC.refersD.lies答案：BCBA9、Asaresultofthisevent,agreatdustcloudformedintheskyblockingoutthesunlight.这个事件的结果就是，天空形成了一团团的灰尘，遮蔽了阳光。blockoutvt.封闭；遮挡Thatwallblocksoutallthelight.那堵墙把光都遮住了。Blockouttheunimportantpartonthepicture.把照片上不重要的部分遮住。联想扩展：blockvt.（1）堵住；阻塞Abigstonehasfallenfromthemountainandblockedtheroad.一个大石头从山上掉下来阻塞了道路。Thepipeofheatmustbeblockedup.暖气管子肯定是堵