题目内容
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[主观题]
According to the passage, the parity system is used to ______.A.encourage farmers to produ
According to the passage, the parity system is used to ______.
A.encourage farmers to produce more grains in the future
B.lower the cost of producing agricultural product
C.determine the prices below which grains will not be sold
D.ensure that the farmers' interest is properly protected
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