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The National Farm Administration (NFA) has been concerned over the last decade with the struggles of barley growers.

Plan: In an effort to support these barley growers, two years ago, the NFA began a program of sending them, each autumn, a free special mix of fertilizer and enzymes designed to multiply barley yield, to be applied the following spring during first growth. This mix had been stunningly successful in multiplying the yield of barley in laboratory conditions.

Results: Most barley growers reported little change in their economic status over this two year period.

Further information: All barley growers received the shipments, and all used them. Weather conditions have been fair to optimal for barley growth over the past two years. In light of the further information, which of the following, if true, does most to explain the result that followed the implementation of the plan?
  • ADuring these two years, most of the barley growers reported using no other fertilizer besides the special mix sent by the government. 分析该选项
  • BThe trucks that drove the special mix from the depot in Wisconsin to the individual farms sometime took as much as 4 or 5 days. 分析该选项
  • CSome of the enzymes in the special mix multiply the growth of a bacteria that feeds on the young barley plants. 分析该选项
  • DThis program was implemented at a time when more than half of barley growers nationwide were reported barely breaking even in their yearly expenses. 分析该选项
  • EThis was the second such NFA program to aid barley growers; the first one, 14 years ago, was started with high hopes, but did little to change their situation. 分析该选项
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正确答案: C

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