1) What is civilization? a) b) 2) What is urbanization? a) b) 3) What is division of labor? a) b) 4) What is a social structure? a) b) 5) What are writing systems? a) b) 6) What is religion? a) b)

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?