初二上学期英语课文我要第三模块第二单元的课文.谁能给我?要外-查字典问答网
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  初二上学期英语课文我要第三模块第二单元的课文.谁能给我?要外研版的!分好说.半小时之内!发上来!

  初二上学期英语课文

  我要第三模块第二单元的课文.谁能给我?要外研版的!分好说.半小时之内!发上来!

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2020-03-18 16:00
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胡耀光

  ScientiststhinkthattherehasbeenlifeonEarthformillionsofyears.However,wehaven'tfoundlifeonotherplanetsyet.Whynot?

  TheEarthisaplaneanditgoesaroundtheSun.SevenotherplanetsalsogoaroundtheSun.Noneofthemhasanenvironmentwithair,sopeopleandthingscannotgrow,TheSunanditsplanetsarecalledthesolarsystem.Thesolarsystemisasmallpartofourgalaxy.

  Thestarsweseeatnightarethesunsinothersolarsystems.Therearemorethan200billionstarsinourgalaxy,calledtheMilkyWay,andourSunisonlyoneofthem.

  Butscientistshavediscoveredmanyothergalaxiesintheuniverse.Theyarealongwayawayandtheirlighthastravelledformanyyearstoreachus.Itishardtounderdtandhowlargetheuniversis.

  Sinentistshavesentlostofspacecrafttolookatotherplanetsinoursolarsystem,andsomespacecrafthavegonebeyondthesolarsystem.Howener,noonehasdiscoveredanylifeinspaceyet.

  Butwhyhansnoonefromohterplanetssentusamessage?Havetheytriedtosendinformationtous?Withsomanyatarsintheuniverse,arewealone,oristherelifeoutthereinspace?Wedon'tknow...yet.

2020-03-18 16:05:03

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