GWD19-28

BBAC

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.  ossibly, 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
各位请教一下这道题的思路~~答案给的是c 可我觉得是无关的~~谢啦~

sdcar2010

This is causation vs. correlation.  

A closely related group of plants survives the high concentration of metals in soil.  The stimulus provides a hypothesis that the production of histidine in one herb from this group of plants is required for the herd to detoxify the metal.  If other plants from the same closely related group are also found to produce histidine and we already know these plants can deal with the metals, then it is more likely the stated hypothesis is right.