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阅读理解Scientiststhinkthattherehasbeenlifeontheearthforhun...
问题详情:阅读理解Scientiststhinkthattherehasbeenlifeontheearthforhundredsofmillionsofyears.However,wehavenotfoundlifeonanyotherplanetsyet.Theearthisaplanetanditgoesaroundthesun,whichisastar.Sevenotherp...