请教nn们一道GWD逻辑,多谢

satancn

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

答案给的是C，不太理解。。。这个finding跟metal-rich soil有什么关系。。。

satancn

顶一下，nn们帮忙看看，我觉得选E

sjtupeeler

逻辑区有专门的讨论帖的，可以过去看一下

不过这道题目我觉得是不是应该选D啊，反正我没看出来C是怎么加强的

gmatwc

e显然是无关选项，压根也没提随着成熟了，浓度下降的事啊~

angelwds

lawyer 原话：

改题实质上是支持题。
            

原文给的信息是

1.某类相关性很大的植物能生长于有毒金属土壤中

2.其中一种能产生大量H, 该酸能是有毒金属失去活性

结论: 该H酸导致该植物能生长于有毒金属土壤中(因果关系结论)

C.类似植物能生长于有毒土壤中(有果), 它们一样产生H酸(有因)

ABE无关. D只能支持原文给的信息2. 这里要强调的一点是D因为没有给额外的信息, 没有使前提对结论的说服性增强, 前提和结论的相关性增强,所以不是答案.看我写的一篇在置定铁里关于什么才算加强和削弱的文章.

强调的一点是单纯支持前提不算支持, 只有使前提对结论的支持强度增大, 前提和结论的相关性变大, 对结论的说服力变大,
        才算支持.GMAT考来考去, 就在考说服力的问题.

sjtupeeler

嗯，看了一下，的确应该选C，有因有果是加强