本贴相关题目 TN-19-CR-28 (QLJP)

00:00:00

Which of the following most logically completes the argument?
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 herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb's high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.

Ahistidine is found in all parts of the plant-roots, stem, leaves, and flowers
Bthe herb's high level of histidine production is found to be associated with an unusually low level of production of other amino acids
Cothers of the closely related group of plants are also found to produce histidine in large quantities
Dcultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
Ethe concentration of histidine in the growing herb declines as the plant approaches maturity

正确答案: E

28. GWD28-Q28,一道纠结的CR，值得讨论下

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hjxsparrow

楼主

发表于 2010-10-31 16:57:53 | 显示全部楼层

正解必须是D

首先题目要我们加强的是一个hypothesis
这个hypothesis题中给的是the herb’s high histidine production is what allows it to grow in metal-rich soils.（h是该植物成活的原因）

题干中关于h的作用的描述只有an amino acid that, in test-tube solutions, renders these metals chemically inert. 就是说h可以使得这些metal 化学活性变惰

那么现在要加强这个假说只需要加强是因为h的这种特殊作用导致该植物可以生存，那么其他植物也可以在这种土壤里生存，也就说明了土壤里的metal chemically inert，证明是h使得该植物适宜在此土壤中生存

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至于C。这类植物还都长叶子呢，难道就可以说它们是因为都长叶子所以就可以在这种土壤里生存么