一道逻辑题，请大家帮我看看

serenashu

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

这题我选的E，答案是C，我不知道该怎么理解~~

stellina

Herb这个东西（注意文中说 is one of a group of closely related plants)能生长在高金属含量的土壤（这个土壤对其他大多数植物有毒）里，专家就说这个Herb产生了H这种酸，这种酸在试管实验里可以融化金属。于是得结论：Herb里的H酸让它能生长在高金属含量里的。

要求SUPPORT这个结论。

C选项：其他closely related plants（这些plants也是生长在高金属含量的土里，看文中第一句）也有很多H酸。。

E选项：植物成熟H酸变少，无关选项。。。

stellina

我发现我啥也没干 就是帮你翻译了下 这题很简单啊

serenashu

那是我没看懂题目吧，谢谢！！