初中二年级上册(外研社)(精)ppt课件

.,1,EnglishBook2,初中二年级上册(外研社),龙里民中张秋桂,.,2,Unit2Wehaventfoundlifeonotherplanetsyet.,Journeytospace,Module3,.,3,Lookatthepictureandthetitleoftheunit.Thinkaboutthingsyouknowaboutlifeonotherplanets.,.,4,Wevebeentothemoon,andtheresnolifethere.ScientiststhinkthattherehasbeenlifeonEarthformillionsofyears.However,wehaventfoundlifeonotherplanetsyet.Whynot?,.,5,.,6,TheEarthisaplanetanditgoesaroundthesun.EightotherplanetsalsogoaroundtheSun.Noneofthemhasanenvironmentwithair,sopeopleandthingscannotgrow.TheSunanditsplanetsarecalledthesolarsystem.Thesolarsystemisasmallpartofourgalaxy.,.,7,Thestarsweseeatnightarethesunsinothersolarsystems.Therearemorethan200billionstarsinourgalaxy,calledtheMilkyWay,andourSunisonlyoneofthem.,.,8,Butscientistshavediscoveredmanyothergalaxiesintheuniverse.Theyarealongwayandtheirlighthastravelledformanyyearstoreachus.Itishardtounderstandhowlargetheuniverseis.,.,9,Scientistshavesentlotsofspacecrafttolookatotherplanetsinoursolarsystem,andsomespacecrafthavegonebeyondthesolarsystem.However,noonehasdiscoveredanylifeinspaceyet.,.,10,.,11,Butwhyhasnoonefromotherplanetssentusamessage?Havetheytriedtosendinformationtous?Withsomanystarsintheuniverse,arewealone,oristherelifeoutthereinspace?Wedontknowyet.,.,12,ReadthepassageinActivity2andchoosethebesttitle.Putthewordsandexpressionsintheboxinorder:smalllarge,galaxyplanetsolarsystemstaruniverse,planetstarsolarsystemgalaxyuniverse,.,13,1.TheEarthisastar.2.TheSunisastar.3.Thereismorethanonegalaxy.4.OurgalaxyispartoftheMilkyWay.,Check()thetruesentences.,.,14,5.Thelightfromstarshastakenalongtimetoreachus.6.Scientistshavefoundlifeonotherplanets.7.Theyvereceivedmanymessagesfromspace.8.Theyvevisitedmostoftheuniverse.,.,15,Answerthequestionsaboutthewordsinthebox.,airalonebeyondgrowmillionreach,1.Whoandwhatneedsair?2.Howoftenareyoualone?3.Whatistherebeyondyourschoolentrance?,.,16,4.Howmuchhaveyougrowninthelastthreeyears?5.Whatcostsamillionyuan?6.HowlongdoesittaketoreachBeijing/Guangzhou?,.,17,LookatthecartoonpictureinActivity6andanswerthequestions.Whathavethescientistsjustheard?(messagefromspacecraft)Theyvejustheardamessagefromaspacecraft.,Writing,.,18,1.Wherehasitlanded?(Mars)_2.Whathasitdiscovered?(people)_3.Whyhaventtheysentusamessage?(canthearus)_,.,19,4.WhyhaventtheyvisitedusonEarth?(preferlifeonMars)_5.Whathavetheymadewiththeotherspacecraft?(TVs,radios,cars)_,.,20,e.g.Theoldmanwasaloneinthehouse,hefeltverylonely.这位老人一个人在屋里,他感到非常孤独。,Importantanddifficultpoints,aloneadj.孤独,.,21,Shelivesalone,butshedoesntfeellonely.她独自住着,但并不感到孤独。2.beyondprep.Morethansth.超出;除之外Wehavelearnedbeyond3,000words.我们已经学了3000多个单词.,.,22,e.g.ItssaidthatmorethanoneplanetgoaroundtheSuninthesolarsystem.据说在太阳系里不止有一颗行星绕太阳转.,3.morethan意思是“多于”,同义词为over,反义词组lessthan.,.,23,4.noone意思是“没人”,是两个单词.noone=nobody,指人;做主语时,谓语动词只能用单数,不能用复数.noone后面不能接of.e.g.Noonetoldusaboutthat关于那件事没人告诉过我们.,.,24,none也有“没人”之意,而且还有“没有物”之意,不过是指三人或三人以上的人或物.做主语时,其谓遇动词用单复数都可以.none一般可与of连用.,e.g.Noneofyouhaventfinishedthework.你们都没有完成这项工作.,.,25,5.somany意思是“那么多的”修饰可数名词复数,经常与that从句搭配,构成“somany+可数n.复数that”句型。,e.g.Therearesomanystarsintheskythatnonecancountout.天空中这么多的星星,没有人数得清。,.,26,e.g.Heatesomuchfoodthathecouldntstandup.他吃了那么多食物以至于站不起来了。,somuch“那么多的”修饰不可数名词。,.,27,6.ScientiststhinksthattherehasbeenlifeonEarthformillionsofyears.科学家认为地球上存在生命已经数万年了。精讲:这是一个含有that引导的宾语从句的复合句,从句中therehasbeen是therebe结构的现在完成时态。,.,28,millionsof是一个常用短语，表示“数百万计的”,指不确切数字,而确切数字是:one,two,three等基数词+hundred,thousand,million或billion+可数名词复数.e.g.Therearefourhundredstudentsinourschool.,.,29,7.Thesunanditsplanetsarecalledthesolarsystem.太阳和它的行星被叫作太阳系.精讲:本句中的arecalled是被动语态.被动语态的构成:be+过去分词.e.g.Thepictureisdrawnbyhim.Theletteriswrittenbyher.,.,30,8.Thestarsweseeatnightarethesunsinothersolarsystems.精讲:句中的star,指的是能发光的恒星,每个恒星包括它的卫星(行星)以及行星的卫星(如地球的卫星月球)统称一个太阳系.月亮之所以发光是因为它能反射太阳光.,.,31,9.Scientistshavesentlotsofspacecrafttolookatotherplanetsinoursolarsystem,andsomespacecrafthavegonebeyondthesolarsystem.科学家已经发射了许多宇宙飞船去探索我太阳系中的其他星球,而且有一些已经驶向太阳系之外.,.,32,Writethestoryinthepict