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出版社： DK CHILDREN ISBN：9780756682590 出版时间：2011-06-20 页数：128
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4 e& f& B4 T0 m% R' G& \A group of people that farms the land to create surpluses of food, lives in cities, has a society with a hierarchy, and is ruled by some form of government is said to be a“civilization.” Civilizations emerged gradually at different times around the world. The first civilizations developed in the Middle East, where farming first began around 10,000 years ago, in a place called Mesopotamia.5 C; J# P; T( a W
Farming first started as a result of climate change at the end of the last ice age. Before that, people were hunter-gatherers, moving from place to place in search of food. However, the new weather conditions changed the previous distribution of plants, which people had been familiar with. It is believed that people began planting wild seeds and
% S0 X0 Y( C9 D' y, Ltubers as a way of guaranteeing their food supply.6 B I& _9 o T0 K
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发表于 2018-10-24 14:32:11
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发表于 2018-11-4 17:09:25
