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标题: GWD28-Q28,一道纠结，C or D,我搜索过了，但是没有能说服我的 [打印本页]

作者: 雪梦儿 时间: 2011-7-24 19:33
标题: GWD28-Q28,一道纠结，C or D,我搜索过了，但是没有能说服我的
GWD28-Q28,一道纠结的CR，值得讨论下

28. GWD28-Q28:
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.（惰性）

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

作者: sdcar2010 时间: 2011-7-24 19:39
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.

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.

作者: 雪梦儿 时间: 2011-7-24 19:45
可我怎么觉得C无关呢，其他的相关plant怎么样，产不产h，好像不会有影响啊。。。

作者: 雪梦儿 时间: 2011-7-24 20:37

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.

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.

-- by 会员 sdcar2010 (2011/7/24 19:39:20)

再看一边解释我觉得我可以理解C对了，因为大家都具有同一种性质，而大家都可以在这种土壤生存，所以就应该是这种性质导致了可以在这种土壤生存，但是D为什么不可以呢？
D的话说明了，那个产生的h将土壤里的metal中和了，所以就别的生物就可以生存了。。。这样推理哪里不对呢？

作者: jameshzd 时间: 2011-7-24 22:16
这里有个 gap，thrive 是修饰a group of closely related plants ，而 A certain cultivated herb只是其中的一员，现在文中举出这个certain cultivated herb能产出 large amounts of histidine，因此得出结论 large amounts of histidine 是能grow in metal-rich soils 的原因，这样就有了一个gap，这一个 group都可以在这个metal-rich soils 里面存活，但是文章只列举了它里面的一员有这个特征，从而推出这个特征导致可以在metal-rich soils 里面存活，C这号填补了其他成员也具有这个特征，而D中，没有任何信息说h 可以和metal 中和啊，只说h 能是plants 存活，没说可以把metal中和。

作者: deifica 时间: 2011-7-24 22:47
为什么不选E。。我悲催地问。。。有没有筒子和我一样觉得选E

作者: jameshzd 时间: 2011-7-24 22:51
E 是无关啊，你怎么想的列？

作者: deifica 时间: 2011-7-24 22:54
http://www.urch.com/forums/gmat-critical-reasoning/108597-certain-cultivated-herb.html 还好老美有同意我的。。

作者: deifica 时间: 2011-7-24 22:59

E 是无关啊，你怎么想的列？

-- by 会员 jameshzd (2011/7/24 22:51:23)

这道题是有争议的，我会选E，至于详细解释可以参考我的那个Link,表示同意那个老美的思路（第一个回帖），因为C只是说分泌大量的histine并没有说明为什么这种histine就是植物在deterimental environment生长的原因

作者: deifica 时间: 2011-7-24 23:00

可我怎么觉得C无关呢，其他的相关plant怎么样，产不产h，好像不会有影响啊。。。

-- by 会员雪梦儿 (2011/7/24 19:45:00)

~~我们同一战线~~挖哈哈

作者: jameshzd 时间: 2011-7-25 08:07

可我怎么觉得C无关呢，其他的相关plant怎么样，产不产h，好像不会有影响啊。。。

-- by 会员雪梦儿 (2011/7/24 19:45:00)

~~我们同一战线~~挖哈哈

-- by 会员 deifica (2011/7/24 23:00:41)

看我在5楼的解释撒~

作者: 雪梦儿 时间: 2011-7-25 09:54

http://www.urch.com/forums/gmat-critical-reasoning/108597-certain-cultivated-herb.html 还好老美有同意我的。。

-- by 会员 deifica (2011/7/24 22:54:13)

话说我上次在这个论坛上面去注册，结果注册失败了。。。

作者: sdcar2010 时间: 2012-1-2 11:31
E) is a wrong answer.

E) the concentration of histidine in the growing herb declines as the plant approaches maturity.
If so, then the herb has less and less histidine before REACHING adulthood. And if histidine is required for the herb to survive in the metal-rich soil, the herb would DIE before reaching maturity. This is CONTRARY to the premise: the herb THRIVES in that type of soil.

作者: alancui 时间: 2012-2-6 20:17
I chose D, and in fact, some plants really do that with histidine.

E) is a wrong answer.

E) the concentration of histidine in the growing herb declines as the plant approaches maturity.
If so, then the herb has less and less histidine before REACHING adulthood. And if histidine is required for the herb to survive in the metal-rich soil, the herb would DIE before reaching maturity. This is CONTRARY to the premise: the herb THRIVES in that type of soil.

-- by 会员 sdcar2010 (2012/1/2 11:31:04)

作者: sdcar2010 时间: 2012-2-6 22:41
No. The conclusion of the passage is:
the herb’s high histidine production is what allows it to grow in metal-rich soils.

D) does not strengthen this conclusion, since D) only confirms that the herb can survive but D) is moot as to the REASON why it does so.

I chose D, and in fact, some plants really do that with histidine.

-- by 会员 sdcar2010 (2012/1/2 11:31:04)

-- by 会员 alancui (2012/2/6 20:17:53)

作者: yangcherry 时间: 2012-4-5 12:25
其实C就是说herb所属的那个group的植物，跟herb一样都有H这个东西。我觉得这个答案属于直接加强结论类型，这种答案出现的比较少，所以大家一看什么others之类的词就觉得无论如何都不应该是它。

作者: bay881024 时间: 2012-7-8 03:16
不太赞成c啊。。原文结论是"the herb's..."答案应该只refer to this kind of herb rather than its closely related group of plants吧。个人认为C是干扰相，实则为无关项，原文要求加强的结论是“h这种物质和这种herb能在metal-rich soils里存活的关系”，对象是这种特指的herb：“the herb’s high histidine production is whatallows it to grow in metal-rich soils”。
再看D，原文说“ itproduces large amounts of histidine, an amino acid that, in test-tubesolutions, renders these metals chemically inert.”
D选项很好地填补了gap，紧贴结论：“cultivation of the herb in soil with highconcentrations of the metals will, over an extended period, make the soilsuitable for plants to which the metals are toxic”

注意看颜色对应部分。
拙见，欢迎拍砖

作者: Bianshaozhe 时间: 2012-12-7 08:20
谢谢各位大神的指点，减少gap

作者: 菠萝蜜夭夭 时间: 2015-5-11 20:30
同意17楼！！！！！！

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