28-28: 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

The key is E, but my answer is C.

我觉得选d

c无关

e随着herb的成熟,the concentration of histidine减少,可以理解为hitidine用于减少土壤的毒性,但也可以理解为只是减少,但并未对土壤毒素起作用,所以如果没有更好的选项是可以选e,

d经过一段时间,种植h的土壤可以适合原本会中毒的那些植物生长,非常直接地support了假设