Unit4Astronomy:thescienceofthestars教学目的和要求（Teachingaimsanddemands）类别课程标准要求掌握的项目话题Scienceofthestars；thedevelopmentoflife；spacetravelandgravity词汇astronomyatmospheresystemviolentsolidexplodeexistmasscarbondioxideoxygensurfaceplanetharmfulspreadfloatdevelopmentmethoddependpresencetelescopedisappointcheerdisappointedpublishpublishinggravityforcegradually词组、短语solarsystemintimeprevent...fromdependoncheerupnowthatbreakout功能指示（Instructions）Pleaselookat/listento...Pleasepayattentionto...Pleasecheckthat...Makesureyou...Don’tforgetto...Watchoutfor...Youneed...You’dbetter...Youmust（n’t）...语法主语从句（Nounclausesasthesubject）Whatitwastobecomewasamystery......itwasnotclearwhetherthesolidshapewastolastornot.随堂练习1、Doyouknowthefollowingsubjects?①MedicineMedicineisasubjectthatcontainsbiologyandchemistry.②BiochemistryBiochemistryisasubjectthatcontainsbiologyandchemistry.③GeophysicsGeophysicsisasubjectthatcontainsgeologyandphysics.④AstronomyAstronomyisasubjectwhichusesknowledgebothfrommathematicsandphysics.2、Thinkaboutwhatyouhavereadandmakechoices.①Whywastheearthdifferentfromotherplanets?（B）AItproducedalotofheat.BThewaterremained.CWaterdisappeared.DItwastheoldestplanet.②Whywaslifeabletodevelopontheearthbutnotonotherplanets?（C）ATheearthhadasolidshape.BTheearthdidnothaveharmfulgasesinitsatmosphere.CThewaterstayedontheearthbutnotonotherplanets.DTheearthwasnottoohotandnottoocold.③Whywasitnecessaryforplantstogrowbeforeanimals?（B）AAnimalsneededplantstoprotectthemfromthesun.BPlantsprovidedoxygenforanimalstobreathe.CAnimalscouldhidefromhuntersinforests.DItwaseasierforplantstogrow.④Whatproblemiscausedbyhumanbeings?ATheyexisteverywhereontheearth.BTheycauseglobalwarming.CTheyfindnewmethodsofgrowingcrops.DTheyenjoyhuntingandfishing.2、Canyouputtheorderofdevelopmentoflifeintoatimeline?Usethereadingtohelpyou.Ainsectsandamphibiansappear⑦Basolidball②Creptilesappear⑧Dacloudofdust①Eshellfishandotherfishappear⑤Fdinosaursappear⑨Gsmallplantsgrowonthewater④Hplantsbegintogrowondryland⑥Ipresenceofwater③Jmammals（includinghumans）appear⑩3、Answerthefollowingquestions.①Whyisitwronginfilmsandstoriestoshowdinosaursandpeopletogether?Dinosaurdiedoutlongbeforehumanbeingsdevelopedontheearth.②Whydoyouthinkthathumansarethecleverestanimalsontheearth?Theyarethecleverestanimalsbecausetheyhavelargerbrainsthananyothercreaturesontheearthsofar.课堂笔记1、Itexplodedloudlywithfireandrock,theywereintimetoproducethewatervapor,...地球猛烈的爆炸喷出了烈火和岩石，最终产生了水蒸气、……intime=soonerorlater迟早=notlateorwithoutdelay（ontime准时）①Goodlucktohim,thedoctorarrivedthereintimeandtheboywassaved.幸运的是，医生及时赶到，男孩得救了。②You’llunderstanditintime.（=soonerorlater）你迟早会明白这件事的。*betodo常用来表示不可避免将要发生的事或必须要做的事。①Thisdiscoverywastohaveamajoreffectonthetreatmentofheartdisease.这个发现对心脏病的治疗产生了重大影响。②Mr.Clarksaidtohisdaughter,“Youaretobehomeby10o’clockatthelatest.”克拉克先生对他的女儿说，“你必须在10点以前到家。”③Iwas（about）toleavewhenmyunclecamein.（此时betodo=beabouttodo）我正要出发，这时叔叔进来了。2、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。allowsbtodo允许某人做某事allowdoing准...
