【OG24-673题】In the last few years, plant scientists have been able to genetically engineer seeds to produce crops highly resistant to insect damage. Farmers growing crops with these seeds will be able to spend significantly less on pesticides. This cost reduction would more than make up for the higher cost of the genetically engineered seeds. Clearly, therefore, farmers who grow crops from genetically engineered seeds will be able to reduce their costs by using them. Which of the following, if true, most weakens the argument?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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In the last few years, plant scientists have been able to genetically engineer seeds to produce crops highly resistant to insect damage. Farmers growing crops with these seeds will be able to spend significantly less on pesticides. This cost reduction would more than make up for the higher cost of the genetically engineered seeds. Clearly, therefore, farmers who grow crops from genetically engineered seeds will be able to reduce their costs by using them.

Which of the following, if true, most weakens the argument?

Plant scientists have not yet developed insect-resistant strains of every crop that is currently grown commercially. The cost of several commonly used pesticides is expected to rise in the next few years. Crops grown from the genetically engineered seeds require significantly more fertilizer and water to grow well than do crops grown from nonengineered seeds. In the future, the cost of genetically engineered seeds is likely to fall to the level of nonengineered seeds. The crops that now require the greatest expenditure on pesticides are not the ones for which genetically engineered seeds will become available.

正确答案： C

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题干翻译
转基因种子抗虫害。种植这些种子的农民在杀虫剂上的花费会大幅减少。这种成本降低足以弥补转基因种子的高成本。因此，显然种植转基因种子的农民能够通过使用它们来降低成本。 逻辑链
Genetically engineered seeds→Cost reduction 问题类型
削弱题 推理过程
论点是种植转基因种子的农民能降低成本，论据是转基因种子抗虫能减少杀虫剂花费且成本降低能弥补种子高价。要削弱该论点，需找到其他会使种植转基因种子成本不降反升的因素。 选项分析
A选项：植物科学家还没有为目前所有商业种植的作物开发出抗虫品种。只说了部分作物情况，未涉及成本问题，无法削弱，排除。 B选项：几种常用杀虫剂的成本预计在未来几年会上升。这可能使转基因种子减少杀虫剂花费的优势更明显，有加强作用，排除。 C选项：转基因种子种植的作物比非转基因种子种植的作物需要显著更多的肥料和水才能长得好。意味着使用转基因种子会增加肥料和水的成本，有可能抵消杀虫剂成本的减少，甚至使总成本增加，削弱了论点，当选。 D选项：未来转基因种子的成本可能会降至非转基因种子的水平。这是在说种子成本下降，对降低总成本有帮助，有加强作用，排除。 E选项：现在在杀虫剂上花费最多的作物不是转基因种子可应用的作物。但未提及这些作物使用转基因种子后的成本情况，无法削弱，排除。

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