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标题: GWD-28-28，请教思路 [打印本页]

作者: v22 时间: 2005-9-10 17:15
标题: GWD-28-28，请教思路

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

乱选了E，大家看看，你的思路是怎样？？？？

作者: v22 时间: 2005-9-10 17:18
化学的NN，快来拉

作者: likui 时间: 2005-9-10 18:07

The best choice should be D

作者: piaony 时间: 2005-9-11 06:03
我的理解是therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils 里的high histidine production 说明E 不对，因为E 说随着植物渐渐成熟，它的consentration 会逐渐降低。所以D对。

作者: v22 时间: 2005-9-11 09:38

结论说的H能够在丰富的铁下生存是因为： large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert。吸纳那些化学物质。

D说一定时间后，herb会令土壤适合那些不能生长在铁下的植物开花结果。

而E说，随着herb慢慢成熟，H会降低。

NN来说说看看啊~~~

作者: howardwang 时间: 2005-9-11 21:29
本题以前讨论过多次，明显C

作者: howardwang 时间: 2005-9-11 21:37
http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=131287&replyID=&skin=0

作者: howardwang 时间: 2005-9-11 21:42

昨天看过一个帖子。大概是以JJ为题目的，第二题就是楼主贴出的题。lawyer NN的答案就是C.不过好像没有解释。

anyway,楼主可以自己搜搜。

作者: v22 时间: 2005-9-11 21:44

啊？C为什么呢？

我怎么没看到讨论该题的帖子？

兄弟能说清楚么

作者: v22 时间: 2005-9-11 21:46
哦，谢谢

作者: leiby1019 时间: 2005-12-8 14:34

明白了这题ets阴险的很完全是阅读问题

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.

注意是thrive 说明是a group of closely related plants 都可以在这种土地里生长。

所以选择C。

作者: steveyangxt 时间: 2005-12-11 22:05
艾就c 最近了乐呢

作者: gavinchan 时间: 2005-12-12 08:53

支持D

D选项其实很好地继续了文中的研究,文中的研究只说到产生amin acid,并把metals惰化,并没有继续解释这样会有什么结果. D选项恰恰提供了这样的结果,土壤变得适合生长. 把 amin acid renders these metals chemically inert(惰性的,无活动的)与suitable for plants to which the metals are toxic联系了起来,说明histidine对植物在含金属土壤里生长有影响,.

如果选C,因为herb是one of a group of closely related plants,那么既然herb能够produces large amounts of histidine,那么和herb closely related 的plants也可能produce histidine in large quantities(它们具有的共同的特点),这样并不能说明或者加强the herb’s high histidine production is what allows it to grow in metal-rich soils.

个人观点,欢迎讨论

作者: lxzjojo 时间: 2006-12-13 14:35

原本也选的C，现在看完讨论觉得D比较有道理，偶的看法是：

C说：others of the closely related group of plants are also found to produce histidine in large quantities，herb是属于这个group没错，而这个group也是能 thrive in soil with high concentrations of metals，问题是C并没有指出其他能产生大量histidine的植物是在高铁环境生存时产生这些histidine啊，有可能它们在任何环境下都会产生这些histidine呢？如果是这样的话就变成削弱啦！

反观D，因为herb产生的histidine能令金属铁产生惰性，从而不影响植物的生长，那么在有herb的环境下一般植物自然亦能生长啦，因为原本很toxic的metal都没有影响了，所以D为答案。

[此贴子已经被作者于2006-12-13 14:50:32编辑过]

作者: liubin1987 时间: 2007-2-7 12:25

我觉得C好.

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