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.  ossibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
D. cultivation 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
the herb’s high histidine production is what allows it to grow in metal-rich soils
题目结论——histidine 导致grow in metal-rich soils“因为histidine renders these metals chemically inert”
那么我们要获得的支持就是论证“因为”部分——D选项充分论证了“因为”部分。
所以我强烈认为答案有误——应该是D
-- by 会员 薇洋祈轩 (2010/3/13 19:48:39)
原文中的确是说histidine 导致grow in metal-rich soils“因为histidine renders these metals chemically inert”
那么即使要直接加强这个原因，也应该是加强histidine的确起到了renders these metals chemically inert，可是renders these metals chemically inert和make the soil suitable for plants to which the metals are toxic有什么逻辑关系呢？土壤变得适合其他植物生长了就一定是因为histidine renders these metals chemically inert吗？其他原因都排除了吗？最起码，单凭文章中的内容是不能这样判断的。
简而言之，就是make the soil suitable for plants to which the metals are toxic不能推出histidine renders these metals chemically inert，无法支持原文 | 
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发表于 2010-3-14 07:40:06
