[讨论]XDF补充材料上的最新机考题（二）

ring_cheng

178. 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, and amimo acid that, in test-tube solutions, reders 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 approach maturity.

Key: E

有谁能解释一下这道题的解题思路是什么？

如果说herb需要histidine来帮助抵抗metals的话，那么histidine不应该降低才对的吧？

ring_cheng

I am looking up

you are showing up

and then we both cheering up

'coz the problem has been ended up

But what i can do now is only up up up......

lawyer_1

答案为C。

问题虽然是完成原文，实质该题为support题。

A原文已说过，所以不构成支持。B无关。C该草本植物是某类能在有毒金属中生长的植物中的一类，如果如C所说，该类的其它植物也能产这种酸，说明是该种酸起作用，故支持。为答案。D提出他因，WEAKEN。E无关

ring_cheng

Thanks, Lawyer, problem cleared up.

谢沁薇

大家看看这个题，如果按照lawyer 牛牛 选c:

C. others of the closely related group of plants are also found to produce histidine in large quantities.

似乎并不支持：therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils,哦

C 仅仅是说产生 histidine     并没有说它适应这种土质

谢谢解疑^-^

gonghao

以下是引用谢沁薇在2006-5-18 15:06:00的发言：

大家看看这个题，如果按照lawyer 牛牛 选c:

C. others of the closely related group of plants are also found to produce histidine in large quantities.

似乎并不支持：therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils,哦

C 仅仅是说产生 histidine     并没有说它适应这种土质

谢谢解疑^-^

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.题目里说过啦

E：成熟后，酸得浓度降低

说不过去啊

要求是support植物能在高金属浓度得土里生长的证据

谢沁薇

sorry 我还是不懂C。 没错是要求 找证据SUPPORT "allows it to grow in metal-rich soils"

但我的问题是c 说其他类似植物能produce histidine in large quantities  并不能support 结论阿

抱歉 麻烦了^-^

谢沁薇

我的问题是不是技术含量很不高呀？

  please...  &_&