第1题
a deseription of the cost of using this new approach of planting crops
第2题
why farmers have to continue the unattainable farming on the infertile land
第3题
how the new mode of farming(IAC)imitates the process of forest
第6题
why does the previous mode of farming need constantly changing places?
第7题
What is the only living member of the Antilocapridae sub-family?
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