单选题
According to the passage, which of the following was a possible motive for the cultivation of plants in eastern North America?
A、
( Lack of enough wild food sources
B、
( Tile need to keep trees from growing close to settlements
C、
( Provision of work for an increasing population
D、
( Desire for the consistent availability of food
【正确答案】
D
【答案解析】
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