一道GWD的争议题，选哪个呢？

mudiduange

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 ______.



Ahistidine is found in all parts of the plant—roots, stem, leaves, and flowers

Bthe herb's high level of histidine production is found to be associated with an unusually low level of production of other amino acids

Cothers of the closely related group of plants are also found to produce histidine in large quantities

Dcultivation 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

Ethe concentration of histidine in the growing herb declines as the plant approaches maturity

mudiduange

结论句：the herb's high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if

要证明结论，其实是要证明是因为这种植物能产生histidine，使这种植物能在高金属含量的土壤里生存。

C选项，感觉缺了点什么。如果说其他的植物能产生histidine的也能在这种土壤里生存，就OK了。但C只说了能产生这种histidine，感觉需要发散一下才可以

mudiduange

结论句：the herb's high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if

要证明结论，其实是要证明是因为这种植物能产生histidine，使这种植物能在高金属含量的土壤里生存。

C选项，感觉缺了点什么。如果说其他的植物能产生histidine的也能在这种土壤里生存，就OK了。但C只说了能产生这种histidine，感觉需要发散一下才可以

-- by 会员 mudiduange (2010/12/29 10:53:07)

The first sentence of the stimulus has already done that:
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

-- by 会员 sdcar2010 (2010/12/29 11:02:48)

还是不太明白呢？
其他植物根第一句讲的herb有什么关系，herb原文是下了一个定义的，而其他植物并一定在这个定义里呀

mudiduange

谢谢