单选题
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1、
Once mankind began farming, they no longer had to
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2、
Tribes living today in the jungle of the Amazon te
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3、
People cannot survive without plants.
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4、
Our direct contact with plants grows with the proc
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5、
Today people usually acquire a large amount of bot
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6、
It is logical that a detailed learning of plants a
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7、
People living in the Middle East first learned to
