【OG24-769题】A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the growth of this herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Hence, the herb’s high histidine production must be the key feature that allows it to grow in metal-rich soils.In evaluating the argument, it would be most important to determine which of the following?_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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A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the growth of this herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Hence, the herb’s high histidine production must be the key feature that allows it to grow in metal-rich soils.

In evaluating the argument, it would be most important to determine which of the following?

Whether the herb can thrive in soil that does not have high concentrations of the toxic metals Whether others of the closely related group of plants also produce histidine in large quantities Whether the herb’s high level of histidine production is associated with an unusually low level of production of some other amino acid Whether growing the herb in soil with high concentrations of the metals will, over time, reduce their concentrations in the soil Whether the concentration of histidine in the growing herb declines as the plant approaches maturity

正确答案： B

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题干翻译
一种草本植物能在对其他大多数植物有毒的金属环境中生长。研究这种草本植物生长的农学家发现它产生大量组氨酸（一种在试管溶液中能使这些金属化学上呈惰性的氨基酸）。因此，这种草本植物的高组氨酸产量一定是使其能在富含金属的土壤中生长的关键特征。 逻辑链
Herb grows in metal rich soil → High histidine production is key 问题类型
评价题 推理过程
论点是高组氨酸产量是草本植物能在富含金属土壤生长的关键，论据是植物产生大量组氨酸且组氨酸能使金属化学惰性。需要判断哪个选项能帮助评估该论点，即判断该选项不同回答对论点的影响。 选项分析
A选项：该草本植物能否在无毒金属高浓度的土壤中茁壮成长。重点是在富含毒性金属土壤中生长与组氨酸的关系，此选项讨论的土壤环境与题干核心不符，无法评价，排除。 B选项：该草本植物密切相关的植物群体中的其他植物是否也大量产生组氨酸。若相关植物也大量产生组氨酸且能在类似环境生长，加强了组氨酸是关键特征；若不产生，削弱了组氨酸是关键特征，可用于评价，当选。 C选项：该草本植物的高组氨酸产量是否与其他某种氨基酸的异常低产量相关。讨论的是组氨酸产量与其他氨基酸产量关系，与在富含金属土壤生长的关键特征无关，无法评价，排除。 D选项：在高浓度金属土壤中种植该草本植物是否会随时间降低土壤中金属浓度。说的是植物对土壤金属浓度的影响，而非组氨酸与植物在富含金属土壤生长的关系，无法评价，排除。 E选项：随着植物接近成熟，生长中的草本植物中的组氨酸浓度是否会下降。组氨酸浓度随植物成熟的变化与在富含金属土壤中生长的关键特征无关，无法评价，排除。

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