- 问题详情:Inrecentyears,theEarthhasbeengettingwarmer.Averagetemperatureshaverisen.Possiblythisisnatural,butprobablywearecausingit.Modernpeopleusealotofelectricityanddrivealotofcars.Thisputscarbondioxide(二氧化碳)intotheairandhelpstomaketheplanetwarmer.Whenwehea...
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