请看一道JJ的CR题，急，谢！

qincong83

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 ______.

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

我选D，不确定，大家看看～总觉得D没提到原文关键词histidine这种氨基酸～

[此贴子已经被作者于2007-7-22 17:47:07编辑过]

raikey

这题有争议,逻辑专区讨论过.
我选C.

wizardking

我选C。如果others of the closely related group of plants 也有大量histidine，那就进一步加强“high histidine production is what allows it to grow in metal-rich soils”，而不是其他the herb本身特有的原因。

qincong83

侧面加强，D。

欢迎讨论！

crowkiller

C