Unit4Astronomy:thescienceofthestarsSectionIWarmingupandReading一、课前预习I.词义配对1.violentA.onethousandmillion2.unlikeB.thescientificstudyofthesun,moon,stars,planetsetc.3.fundamentalC.verystrongandsudden4.chainD.thebeliefintheexistenceofagod5.billionE.makesth.increaseverymuchinnumberoramount6.religionF.tobereal,tobepresentinaplaceorsituation7.astronomyG.differentfromaparticularpersonorthing8.multiplyH.aseriesofconnectedthingsorpeople9.puzzleI.makesb.feelconfused10.existJ.central,formingthenecessarybasisofsth.II.重点短语1.绕太阳转____________________________________2.广泛接受的理论____________________________________3.一团灰尘____________________________________4.是生命发展的基础____________________________________5.连锁反应____________________________________6.产生、分娩____________________________________7.下蛋____________________________________8.轮到某人____________________________________9.阻止、制止____________________________________10.生命的起源____________________________________III.重点句型1.Nooneknowsexactlyhowtheearthbegan,___________________solongago.没有人确切知道地球是怎样开始的,正如同很久以前所发生的一样。2.Forseveralbillionyearsafterthe“BigBang”,theearthwasstilljust______________________________.在“大爆炸”之后的几十亿年,地球仍仅仅是一团灰尘。3.WaterhadalsoappearedonotherplanetslikeMarsbut_____________________,ithaddisappearedlater.水也出现在像火星一样的其他行星上,但是不像在地球那样,它后来消失了。4.Thustheyhave,____________________,becomethemostimportantanimalsontheplanet.因此,又轮到它们成为行星上最重要的动物。5.Theyareputtingtoomuchcarbondioxideintotheatmosphere,which_________________________theearthintospace.他们给大气层投放太多的二氧化碳,阻止了热量从地球上升到太空之中。二、重难点剖析1.Nooneknowsexactlyhowtheearthbegan,asithappenedsolongago.没有人确切知道地球是如何开始的,正如同很久以前所发生的一样。本句是一个复杂的主从复合句。主句中包含how引导的宾语从句和由as引导的方式状语从句。(1)as引导方式状语从句,译为:“按照……;如同……”DoinRomeastheRomansdo.入乡随俗。Heisagoodboyandhealwaysactashismothertellshimto.这个男孩是个好孩子,总是按照妈妈告诉他做的做。(2)as还可引导定语从句,译为:“正如……”,“像……”,引导限制性定语从句时,必须与so,such,as,thesame连用;引导非限制性定语从句时,所指代的不是其前的某个名词或代词,而是这个句子,或者句子的一部分内容。As在定于从句中,充当主语、宾语、表语。Heisnotsuchafoolashelooks.他不像他表面看起来那样傻。Aseverybodyknows,theearthcirclesaroundthesun.人人皆知,地球绕太阳转。(3)as还可引导其他从句,如:时间状语从句,译为:“随着……”;原因状语从句,译为:“因为……”Astimegoeson,hegrowswiserandwiser.随着时间的流逝,他越来越聪明。Ashedidn’tgetreadyforthat,wewentwithouthim.由于他未能做好准备,我们没等他就走了。(4)as引导让步状语从句,译为:“尽管……”Oldasthatmanis,heisasenergeticandactiveasyoungmen.那位先生虽年岁很大,却和年轻人一样有活力,精力旺盛。归纳总结:即境活用:(1)Todayhewasalsothefirsttocometoschool,______isoftenthecase.(2)_______timewenton,Einstein’stheoryprovedtoberight.(3)Hard_______heworked,hestillfailedatlast.(4)Youmustshowthepoorthesamerespect_______youshowyourparents.2.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.随后它会变成什么没人能知道,指导38-45忆年前,这团尘埃才慢慢地形成一个固体的球状物。本句是一个复合句,含有whatitwastobecome的主语从...