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In1800,onlythreepercentoftheworld'spopulationlivedincit...
问题详情:In1800,onlythreepercentoftheworld'spopulationlivedincities.Onlyonecity—Beijing—hadapopulationofoveramillion.Mostpeoplelivedinruralareas,andneversawacityintheirlives.In1900,justahundredyears...