閱讀理解Scientiststhinkthattherehasbeenlifeontheearthforhun...
問題詳情：閱讀理解Scientiststhinkthattherehasbeenlifeontheearthforhundredsofmillionsofyears.However,wehavenotfoundlifeonanyotherplanetsyet.Theearthisaplanetanditgoesaroundthesun,whichisastar.Sevenotherp...