![In1800,onlythreepercentoftheworld'spopulationlivedincit...]( "In1800,onlythreepercentoftheworld'spopulationlivedincit...")
- 問題詳情：In1800,onlythreepercentoftheworld'spopulationlivedincities.Onlyonecity—Beijing—hadapopulationofoveramillion.Mostpeoplelivedinruralareas,andneversawacityintheirlives.In1900,justahundredyearslater,roughly150millionpeoplelivedincities,andthew...
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