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 ______.
A.histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B.the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C.others of the closely related group of plants are also found to produce histidine in large quantities
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
E.the concentration of histidine in the growing herb declines as the plant approaches maturity
仔细想了下觉得C是没有争议的，的确是对的，虽然我最开始也做错了，甚至觉得是引入其他东西，为无关项
但是tx们看下题目第一句（黄色高亮部分）和C中红色部分。个人认为这个有点牵涉到语法和逻辑混在一起。题意中的related group of plants其实是被下过定义了，也就是defined as :that thrive in soil with high concentrations of metals that are toxic to most other plants---所以C中红色部分也是具有这个性质，即在有毒的土壤里繁荣生长的植物。 所以C相当于有效类比，即强化了繁荣生长和自身产生大量histidine之间的correlationship
open to dicuss 作者: helenwolfy 时间: 2011-7-21 14:37
茅塞顿开！这么好的帖子没人顶……作者: hhftnt 时间: 2011-10-29 00:59
请问D错在哪。。。。不解。。。作者: comeondaphne 时间: 2012-3-24 19:07
对D选项，我的理解是：如果这种herb种在土壤里可以降低metals的毒性的话，当metal的concentration大量降低后，这种herb还能存活下去吗？鉴于原文说“ 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”