Unit4AstronomythescienceofthestarsLanguagePoints（授课日期：年月日星期班级）授课题目Book3Unit4LanguagePoints拟课时第课时明确目标1、知识与技能：Helpstudentstolearnsomeimportantexpressionsandsentencestructure..2、过程与方法:Discussionandgroupwork3、情感态度与价值观：Helpstudentstohaveadeeperunderstandingoftheplay重点难点重点：Tohelpstudentsmastersomeimportantpointsofthetext.难点：Improvestudents’comprehensiveability.课型□讲授□习题□复习□讨论□其它教学内容设计因材施教Step1:DictationDictatesomeimportantwordsandexpressionsinUnit4Step2:SentencepatternsNotestosomedifficultsentences1.Afterthe“BigBang”theearthwasjustacloudofenergeticdust.随着“轰隆”一声巨响，地球就成为一个云团，充满着具有能量的尘埃。BigBang(big-bangcosmology)大爆炸宇宙学。2.Itexplodedloudlywithfireandrock,whichwereintimetoproducethewatervapour,carbondioxide,oxygen,nitrogenandothergases,whichweretomaketheearth’satmosphere.它（地球）巨大的爆炸喷出了烈火与岩石，最终产生了水蒸汽、二氧化碳、氧、氮和其他多种气体，从而形成了地球的大气层。3.Nobodyknewthatitwasgoingtobedifferentfromotherplanetsgoingroundthesun.谁也不知道地球会别于环绕太阳运转的其它行星。Step3.Languagepoint1.Itallowedtheearthtodissolveharmfulgases,whichhadbecomepartoftheearth’satmosphere,intotheoceansandseas.它使地球把曾经存在于大气层中的有害气体溶解在海洋里。allow…todo允许某人做某事。如：Herparentswon’tallowhertostayoutlaterthan11:00intheevening.她父母不允许她晚上在外逗留超过11点。PleaseallowmetoexplainthatIdidnothaveanyideaabouthisarrangement.请允许我解释，我事先不知道他的安排。2Thisencouragedthedevelopmentofearlyshellfishandallsortsoffish.这为早期贝类及其他各种鱼类的发育进一步创造了条件。encourage鼓励；促进；怂恿Fatherencouragedhimtostudyphysicsbutheprefersmaths.父亲鼓励他学物理，但他更喜欢数学。Heencouragedmetolearndancing.他鼓励我去学跳舞。3.Theyproducedyounggenerallybylayingeggs.它们一般是通过孵蛋而繁衍后代的。bydoing用于说明做某事的手段，方式。如：Idon’tthinkshecanhelphimbyjustgivinghimmoney.我认为她光靠给钱是帮不了他的。Heusedtomakehislivingbypainting.他以前是靠画画为生。4.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.他们把过多的二氧化碳释放到大气层中，这使得地球上的热不能释放到太空中去。prevent…fromdoing阻止某人做某事。如：Hishearttroubledidnotpreventhim(from)goingtoclassthenextday.他的心脏病痛没能阻止他第二天去上课。Nothingcanpreventtheirplans(from)beingcarriedout.什么也不能阻止他们的计划得以实施。5.Whetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。(sth)dependon(sthelse):somethingmightonlyhappenorbetrueifthecircumstancesarerightforit取决于；决定于。如：“Willyougofishingthisafternoon?”“Well,italldependsontheweather.”“你今天下午去钓鱼吗？”“得看天气。”formillionsofyearstocome中不定式tocome作定语，与前面的名词之间有逻辑上的主谓关系，例如：Step4PracticeMakesentencescorrectlyaccordingtotheimportantwordsandsentencesStep4:HomeworkMakesentences教学后记：
