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标题: 28. GWD28-Q28,一道纠结的CR,值得讨论下 [打印本页]
作者: Cherliuiking 时间: 2010-2-1 12:10
标题: 28. 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
我选D,有人说选E,到底选哪个呢?大家讨论呀
作者: prayer 时间: 2010-2-1 12:50
我在C和E里分不清,D我认为不对,是因为
therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
假设一定要架桥,histidine与grow之间的关系。D说种过这个草的土可以适合别的草长,跟histidine有什么关系,不应该作为假设存在,如果是support,那么D就对。
最后,我又看了看别的讨论帖子,什么答案的都有,不过有个选E的解释很好。
The key is in the question itself..
"the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if"
The hypothesis is in bold-faced text above... if it allows it to grow, then it is also the reason for its saturation (maturity, death if i should say), in growth.. E states that precisely!
mature2 v
[I]
to become fully grown or developed
作者: Cherliuiking 时间: 2010-2-1 14:28
histidine的作用在于 renders these metals chemically inert,减少金属的化学活性,所以这种植物所在的土地的金属的化学毒性减小了,甚至,那些怕化学毒性的植物都能生长了,我本来是这样想的,LS的nn觉得为啥不对呢?
作者: Cherliuiking 时间: 2010-2-1 14:32
或者
therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
E可否这样理解,上面的|grow是的是在成熟前的那部分,成熟了也许就以为这停止生长了,所以长的时候有,不长了就没有了
作者: pammy0926 时间: 2010-2-1 19:09
it produces large amounts of histidine, an amino acid that....renders these metals chemically inert.
我的理解是:这个植物用自己分泌的histidine来换取了金属物毒性的减少。同时,土壤里的金属物质没有一直增加(文中没有提及这个因素),那就意味着,随着植物的成长,分泌的histidine是在减少的,减少的东西都是用来化解金属了。慢慢的,金属毒性没有了,那也没必要继续分泌histidine了。
我感觉E正确噢。
作者: prayer 时间: 2010-2-1 22:06
或者
therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
E可否这样理解,上面的|grow是的是在成熟前的那部分,成熟了也许就以为这停止生长了,所以长的时候有,不长了就没有了
-- by 会员 Cherliuiking (2010/2/1 14:32:39)
是的,这道题就是这个意思。grow停止了,就只剩下being alive
作者: Cherliuiking 时间: 2010-2-2 09:36
呵呵,我明白了,谢谢NN们,明天就考,希望能给大家带回来狗狗
作者: shadow影 时间: 2010-4-21 12:09
IMO E
focus on the conclusion: just about H and GROW!
C.Incorrect : OTHERS IN THE GROUP produce H, but what about H -> GROW?
E.Correct : It is stated in the hypotheses above that histidine allows the herb to GROW. It means that as long as the herb is growing, histidine is high and as the herb approaches MATURITY the concentration of histidine declines.
作者: akiluk 时间: 2010-9-30 15:23
标题: c是对的
大家认真看一下题~
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals.
后面的thrive in soil with high concentrations 修饰的是 a group of closely related plant
文章说 a group 里的一种 herb 因为 histidine可以生长 ,得出(group 中的其他植物也是)因为H这种物质而得以生长,有gap!!
所以选C group 中的其他植物都有H这种物质 这样就可以推出是因为H物质。
作者: hjxsparrow 时间: 2010-10-31 16:57
正解必须是D
首先题目要我们加强的是一个hypothesis
这个hypothesis题中给的是the herb’s high histidine production is what allows it to grow in metal-rich soils.(h是该植物成活的原因)
题干中关于h的作用的描述只有an amino acid that, in test-tube solutions, renders these metals chemically inert. 就是说h可以使得这些metal 化学活性变惰
那么现在要加强这个假说只需要加强 是因为h的这种特殊作用导致该植物可以生存,那么其他植物也可以在这种土壤里生存,也就说明了土壤里的metal chemically inert,证明是h使得该植物适宜在此土壤中生存
======================================================
至于C。这类植物还都长叶子呢,难道就可以说它们是因为都长叶子所以就可以在这种土壤里生存么
作者: eshopaholic 时间: 2010-10-31 20:35
同意D
作者: rangerandom 时间: 2010-11-9 21:10
8楼解释得很好。。原文的意思大致是:
一种cultivated herb属于一大群能存活在high concentrations of metals的植物之一,虽然metals是有毒的,但herb能分泌histidine来阻止毒素,所以herb是因为histidine才存活,问support
C答案是:其它能存活在metals的植物也分泌histidine,由此加强了结论
D答案是:herb在metals中活久了之后,也能让别的植物存活在metals中,根本没提到histidine,明显的无关项
作者: akiluk 时间: 2010-11-9 22:53
8楼解释得很好。。原文的意思大致是:
一种cultivated herb属于一大群能存活在high concentrations of metals的植物之一,虽然metals是有毒的,但herb能分泌histidine来阻止毒素,所以herb是因为histidine才存活,问support
C答案是:其它能存活在metals的植物也分泌histidine,由此加强了结论
D答案是:herb在metals中活久了之后,也能让别的植物存活在metals中,根本没提到histidine,明显的无关项
-- by 会员 rangerandom (2010/11/9 21:10:17)
肯定是c!!
作者: liuyang5249 时间: 2010-12-1 11:03
选C哈,第一句话里的A certain cultivated herb is one of a group of closely related plants不是白给的,逻辑题里面的信息几乎都是有用的,就像那个打印机和打印纸的那个逻辑题。
作者: quill 时间: 2010-12-20 18:39
大家认真看一下题~
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals.
后面的thrive in soil with high concentrations 修饰的是 a group of closely related plant
文章说 a group 里的一种 herb 因为 histidine可以生长 ,得出(group 中的其他植物也是)因为H这种物质而得以生长,有gap!!
所以选C group 中的其他植物都有H这种物质 这样就可以推出是因为H物质。
-- by 会员 akiluk (2010/9/30 15:23:23)
太对了!!
作者: 西门吹鸟 时间: 2010-12-21 16:13
同意八楼, 正解是C
作者: 妞妞扭扭 时间: 2011-7-5 01:04
m
作者: myla32 时间: 2013-9-28 20:18
akiluk 发表于 2010-9-30 15:23
大家认真看一下题~ A certain cultivated herb is one of a group of closely related plants that thrive ...
原来是这样!逻辑真的看题是一点都不能大意
作者: IBiturbo 时间: 2013-9-28 22:28
这题必须选C !!! ,现象:这种植物在有毒的soil里生长。 解释:这种植物可以产生H来降低金属毒性,因此可以生长。 如果要加强这个解释,有一种办法是“有因有果” ,就是再举一个相同的案例,因为前提说过和这种植物很相似的其他植物都可以在有毒的soil 里生长,那么添加一个原因(其他植物里都有大量的H)就可以加强原来的解释啦!~ 而D中存在很多的干扰因素(我觉得如果没有over an extended period比较好),如果觉得分析的不对,就及时指出!
作者: wyx85 时间: 2013-9-29 05:50
第一直觉选D。看了大家的讨论后,似乎觉得选E。后来咨询了一位大牛,给出了这样的解释:本题缺少一个逻辑链,即inert=nontoxic。为了方便理解,还给出了个例子:学校长期受黑帮问题影响(concentrations of metal),现在学校引进了方法A(H)来消灭黑帮,但消灭黑帮后学生一定能学习好么?可能学校还有毒品问题。也就是说,inert metal不一定代表nontoxic,可能inert metal还有别的问题,D选项恰好弥补了这个问题,金属失活后,植物能很好成长。因此答案是D。
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