The main difference between the modem superfarm and diversified farms is______ It can be seen from the passage that the problem

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问题 The main difference between the modem superfarm and diversified farms is______
It can be seen from the passage that the problem of resource conservation in agriculture______

选项 A、has been solved in the U. S.
B、has not yet been paid any attention to
C、is being seriously and effectively dealt with
D、will soon be solved by using more capital and land

答案C

解析 从最后一段可知.联邦政府制订的计划有利于节俭发展农业,过度使用土地、水和燃料的时代已经快结束。答案选项符合题意。
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