八年级下Module3Unit2课件.ppt

《八年级下Module3Unit2课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Unit2Wehavenotfoundlifeonanyotherplanetsyet.earthmoonRevisionspaceshipastronautspacetravelLookatthepictureandtalkaboutwhatyouknowaboutChinesespaceships.Shenzhou-9isamannedspaceship.WorkinpairsScientiststhinkthattherehasbeenlifeontheEarthforhundredsofmillionsofyears.However,wehavenotfou

2、ndlifeonanyotherplantsyet.Readthepassage.TheEarthisaplanetanditgoesaroundthesun.Sevenotherplanetsalsogoaroundthesun.Noneofthemhasanenvironmentlikethatoftheearth,soscientistsdonotthinktheywillfindlifeonthem.Thesunanditsplanetsarecalledthesolarsystem,andoursolarsystemisasmallpartofamuchl

3、argergroupofstarsandplanets,calledtheGalaxyortheMilkyWay.TherearebillionsofstarsintheGalaxy,andoursunisonlyoneofthem.Scientistshavealsodiscoveredmanyothergalaxiesintheuniverse.Theyareveryfarawayandtheirlighthastotravelformanyyearstoreachus.Sohowlargeistheuniverse?Itisimpossibletoimagin

4、e.ScientistshavesentspaceshiptotheplanetMarstotakephotos.Theyhaveevensentspaceshipstotraveloutsidethesolarsystem.However,nospaceshiphastravelledfarenoughtoreachotherstarsinourGalaxy.Readthepassageandchoosethebesttitleforit.1.Anyoneoutthere?2.Lifeontheearth3.Thesunandotherstars4.Thestar

5、satnight√1.Theearthisastar.2.Thesunisastar.3.Thereismorethanonegalaxyintheuniverse.Check(√)thetruesentences.×√√4.Thelightfromthestarsinothergalaxieshastravelledforalongtimetoreachus.5.Scientistshavereceivedmanymessagesfromspace.6.Spaceshipshavevisitedmostoftheuniverse.√××Completethepas

6、sagewiththewordsandexpressioninthebox.communicateenvironmentnonesolarsystemuniverseIstherelifeonotherplanets?Therearesevenotherplanetsinour(1)____________,but(2)______ofthemhasa(n)(3)____________likethatoftheearth.solarsystemnoneenvironmentSpaceshipsfromtheearthhavedonesurveysoftheothe

7、rplanets,buttheyhavenotfoundanylifethere.Whyhasnoonefromotherplanetstriedto(4)_____________withus?Itistruethatscientistshavenotdiscoveredlifeonotherplanetsinthe(5)_________yet,butsomescientistsbelievethattheywillfinditsomeday.communicateuniverse1.Scientiststhinkthattherehasbeenlifeon