刚考过的GWD-CR,答案寻求中?

johnxiong

,Q28:

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 ______.

1. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
           
2. the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids
           
3. others of the closely related group of plants are also found to produce histidine in large quantities

4. 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
           
5. the concentration of histidine in the growing herb declines as the plant approaches maturity

大家看一下这道题目的答案是哪一个呢? 就是LZ考到的那道GWD

patrickzx

A

johnxiong

LS说说你的理由呢，为什么选A呢？

晴天彩虹

同意选A,等待NN们的分析啊...谢谢了!

llinda

我考试中也碰到这道题了，我选B。说明Metal与 histidine 正相关，排除别的酸作用的可能。其他选项都无关。

HenrySung

我選C  因為其他種類植物(跟此herb同樣生長在這高金屬含量土壤的植物) 也都測出了histidine  因此證明有histidine就能幫助植物生長於此類土壤

A只解釋了這個herb的各部位都有histidine  但不能證明她的存活就是因為histidine做的功

B指出兩種化學含量的消長 我也不認為就能證明histidine有效

我選C是因為這個選項明顯地提供了另一個佐證  這是我的想法  不知道對不對???

popofeeling

我认为选D，对结论的直接加强，C中的other related group属于无关项，逻辑版有对此题的讨论，可以去搜一下

johnxiong

我要晕倒了!AB,C,D,E在讨论中都由人选啊,困惑中.....

newton47

肯定选C咯。..

guanxinyu

linda绝对正确,就是选B.求证过GWD本人.这个选项从大方向上考虑无非就是:histidine导致了该结果,而不是其他acids导致了该结果