单项选择题
People cannot survive without plants.
A． Right
B． Wrong
C． Not mentioned
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单项选择题
Tribes living today in the jungle of the Amazon teach botany to their children at school.
A． Right
B． Wrong
C． Not mentioned
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单项选择题
Once mankind began farming, they no longer had to get food from many varieties that grew wild.
A． Right
B． Wrong
C． Not mentioned
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