- 問題詳情:Somepeoplearepessimistic(悲觀的)whentheythinkaboutthefuture.Theysaythat,ahundredyearsfromnow,wewillhaveusedmostoftheearth'sresources.Wewillhavepollutedourseasbadly,andbeunabletoeatfishfromthem.Wewillhavemadetheairsodirtythatwewillneedtowearm...
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