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初中二年级上册(外研社)龙里民中张秋桂Unit2Wehaven’tfoundlifeonotherplanetsyet.JourneytospaceModule3Lookatthepictureandthetitleoftheunit.Thinkaboutthingsyouknowaboutlifeonotherplanets.We’vebeentothemoon,andthere’snolifethere.ScientiststhinkthattherehasbeenlifeonEarthformillionsofyears.However,wehaven’tfoundlifeonotherplanetsyet.Whynot?TheEarthisaplanetanditgoesaroundthesun.EightotherplanetsalsogoaroundtheSun.Noneofthemhasanenvironmentwithair,sopeopleandthingscannotgrow.TheSunanditsplanetsarecalledthesolarsystem.Thesolarsystemisasmallpartofourgalaxy.Thestarsweseeatnightarethesunsinothersolarsystems.Therearemorethan200billionstarsinourgalaxy,calledtheMilkyWay,andourSunisonlyoneofthem.Butscientistshavediscoveredmanyothergalaxiesintheuniverse.Theyarealongwayandtheirlighthastravelledformanyyearstoreachus.Itishardtounderstandhowlargetheuniverseis.Scientistshavesentlotsofspacecrafttolookatotherplanetsinoursolarsystem,andsomespacecrafthavegonebeyondthesolarsystem.However,noonehasdiscoveredanylifeinspaceyet.Butwhyhasnoonefromotherplanetssentusamessage?Havetheytriedtosendinformationtous?Withsomanystarsintheuniverse,arewealone,oristherelifeoutthereinspace?Wedon’tknow…yet.ReadthepassageinActivity2andchoosethebesttitle.Putthewordsandexpressionsintheboxinorder:small—largegalaxyplanetsolarsystemstaruniverseplanetstarsolarsystemgalaxyuniverse1.TheEarthisastar.2.TheSunisastar.3.Thereismorethanonegalaxy.4.OurgalaxyispartoftheMilkyWay.Check(✓)thetruesentences.5.Thelightfromstarshastakenalongtimetoreachus.6.Scientistshavefoundlifeonotherplanets.7.They’vereceivedmanymessagesfromspace.8.They’vevisitedmostoftheuniverse.Answerthequestionsaboutthewordsinthebox.airalonebeyondgrowmillionreach1.Whoandwhatneedsair?2.Howoftenareyoualone?3.Whatistherebeyondyourschoolentrance?4.Howmuchhaveyougrowninthelastthreeyears?5.Whatcostsamillionyuan?6.HowlongdoesittaketoreachBeijing/Guangzhou?LookatthecartoonpictureinActivity6andanswerthequestions.Whathavethescientistsjustheard?(messagefromspacecraft)They’vejustheardamessagefromaspacecraft.Writing1.Wherehasitlanded?(Mars)______________________________2.Whathasitdiscovered?(people)_______________________________3.Whyhaven’ttheysentusamessage?(can’thearus)_______________________________4.Whyhaven’ttheyvisitedusonEarth?(preferlifeonMars)_____________________________5.Whathavetheymadewiththeotherspacecraft?(TVs,radios,cars)_____________________________e.g.Theoldmanwasaloneinthehouse,hefeltverylonely.这位老人一个人在屋里,他感到非常孤独。Importantanddifficultpoints1.aloneadj.&adv.withoutanyotherpeople独自(的);单独(的)lonelyadj.寂寞;孤独Shelivesalone,butshedoesn’tfeellonely.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.e.g.It’ssaidthatmorethanoneplanetgoaroundtheSuninthesolarsystem.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.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.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.Noneofyouhaven’tfinishedthework.你们都没有完成这项工作.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。e.g.Heatesomuchfoodthathecouldn’tstandup.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。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。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.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.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.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.WritethestoryinthepictureinActivity6.UsetheanswerstothequestionsinActivity6tohelpyou.Wb.Ex.1,2,4,5&8Homework教学反思：优点：本节课通过“现在完成时态和被动语态”的学习，让学生了解浩瀚的宇宙。使学生对英语更加热爱，让学生的的确确明白英语让他们打开了看世界的眼睛。图片直观、易懂。不足：教师的太空知识较缺乏，要加强学习。2010年12月