单选题
It can be seen from the passage that the problem of resource conservation in agriculture______
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
【正确答案】
C
【答案解析】
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。(C)符合题意。
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