人教版英语必修三

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1、人教版英语必修三Unit 4 Astronomy:the science of the stars重难点Teachingaims:1.Enablestudentstoimprovetheirlisteningskillsandreadingability.2.Enablestudentstounderstandthedevelopmentofgravityandhowgravityaffectsusindifferenttimesandplaces.3.Arousestudents’interesttosearchforthemysteryofspace.Empha

2、sis:1.Wordsandexpressions:gravity,float,cheerup,nowthat,breakout,etc2.Astronomicknowledgelikegravityandblackhole.Difficulties:1.Helpthestudentstounderstandthedevelopmentofgravity.2.Helpthestudentstoknowhowgravityinfluencesus.Teachingmethods:skimming,scanning,discussing.Teachingaids:ata

3、perecorder,aprojectorandacomputer.【词汇识记】1．太阳系solarsystem 2．及时，总有一天intime3．阻止，制止preventfrom 4．依靠，信赖dependon5．感到高兴cheerup 6．既然，由于nowthat7．蔓延spread 8．一般而言generallyspeaking9．坚固的solid 10.作一次太空旅行makeatripintospace 11．熟悉，掌握getthehangof 12．突发，爆发breakout13．增多，使繁殖multiply 14．大气层，气氛atmosphere15．消

4、失，经过goby 16．与…不同bedifferentfrom17．冷却cooldown 18．失重地weightlessly19．全球变暖globalwarming 20．地心引力gravity【单词用法】1、multiply(数目上)增加，增多；乘；（使）繁殖【经典例句】1)Ourproblemshavemultipliedsincelastyear.2)2and5multiplytomake10.3)6multipliedby5is30.=Multiply6by5tomake30.4)Theplantsheremultiplyrapidly.2、encoura

5、ge鼓舞；促进；怂恿。后接名词、代词，也可接不定式作宾语补足语。如：Highpricesforcornandwheatwillencouragefarming.玉米和小麦的高价将促进农业的发展。【经典例句】Mysuccessencouragedmetocontinue.我的成功鼓励我继续干下去。Heencouragedmetolearndancing.他鼓励我去学跳舞。3、development(1)[U]成长,发育；发展(过程)；扩展【经典例句】Thedevelopmentofthisindustrywilltakeseveralyears.这项工业的发展要经过几

6、年的时间。(2)[C]开发区,新社区anewhousingdevelopment新建住宅区(3)[C]进化,进展；新情况,新闻Whatarethelatestdevelopments?【经典例句】Theuseofcomputersinteachingisarecentdevelopment.教学上使用计算机是新近才有的事.4、atmosphere[＇tmsfI]n.大气层；气氛atmo-(空气,蒸汽)+sphere(球,球体)，大气层是个充满空气的球体。【经典例句】Theexcitingatmosphereofthefootballmatchheldmybre

7、ath.足球比赛的紧张气氛让我大气不敢出。1）同根词：hemisphere(hemi-半)半球体、半个球;（地球或天体的）半球。如：TheNorthernHemisphereisthepartoftheworldnorthoftheequator,andtheSouthernHemisphereissouthoftheequator.北半球是地球赤道以北的部分，南半球是赤道以南的部分。2）该词可引申为“气氛”，即对某一环境的感受。如：Inabaroracafe,usuallythereisaverycozyatmosphere.在酒吧或咖啡厅里，往往都有一种