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

sdcar2010

C is the correct answer. If other plants of a closely related groups also produce histidine, then it means that the histidine lets them live in a soil with high concentrations of toxic metals. This would support the conclusion of the argument.

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

sdcar2010

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

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

lonelyorchid

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

-- by 会员 mudiduange (2011/1/2 22:29:51)

GMAT 所谓的支持就是使得原narration的置信度更高既可。如果H在其他的同类植物都有分布，则正好可以解释为什么这一组对于metal有耐受。你说的那种情况确实可以很强力的支持原文中的假设，但是所谓的支持不一定是强力支持，哪怕是很弱的支持也算。比如，国产汽车质量不好，要支持，我可以说，我家的夏利汽车坏掉了。这就是支持的一种，因为这个个例使得原论断的置信度增加了。

mudiduange

谢谢

sdcar2010

Premise:
1)  A group of closely related plants that thrive in soil with high concentrations of metals.
2)  A certain cultivated herb is one of a group of closely related plants.
3)  The herb produces large amounts of histidine.

Conclusion:
The herb's high histidine production is what allows it to grow in metal-rich soils.

Strengthener:
Other members of the same closely related group of plants are also found to produce histidine in large quantities. These plants thrive in soil with high concentrations of metals.

sophia921112

好解释！

780一次过

补一道题
OG2018-644
A certain cultivated herb is one of a group of closely related plants [that thrive in soil with high concentrations of metals这个修饰的是一组plants] that are toxic to most other plants. Agronomists studying the growth of this herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Hence, the herb's high histidine production must be the key feature that allows it to grow in metal-rich soils.
在一组closely related的植物中，有一种[在含有高mental的土壤能茁壮成长的]植物对most其他植物是有害的。
什么ist研究，这个herb产生大量H，一种氨基酸，使得mental 惰性。因此，高的H允许这个植物生长在mental-rich的土里。
逻辑链：H使mental变得惰性，因此可以使这个herb生长在mental-rich的土壤里。
Argument：高H是这种herb能长在mental-rich土里的key
In evaluating the argument, it would be most important to determine which of the following?
=What evidence would help determine whether the herb’s histidine production is what enables it to thrive in metal-rich soils'?
EVALUATION
(A) Whether the herb can thrive in soil that does not have high concentrations of the toxic metals 能不能长在其他土壤，无关
(B) Whether others of the closely related group of plants also produce histidine in large quantities 这一组的其他植物也能大量产生
H是否相关植物中的其他品种也产生了H；如果相关植物中没有产生H，但是它们也能在金属土壤中生长，说明H不起作用；反之H就起了关键作用；正确
(C) Whether the herb's high level of histidine production is associated with an unusually low level of production of some other amino acid
高level H的产生联系着低level的其他氨基酸的产生，无关
(D) Whether growing the herb in soil with high concentrations of the metals will, over time, reduce their concentrations in the soil
在高mental含量的土里种这种herb，会不会使土壤里的mental含量下降，无关
(E) Whether the concentration of histidine in the growing herb declines as the plant approaches maturity  物质H会不会影响成熟，无关