GWD-28-28，请教思路

v22

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？？？？

v22

化学的NN，快来拉

likui

The best choice should be D

piaony

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。

v22

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~~~

howardwang

  本题以前讨论过多次，明显C

howardwang

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=131287&replyID=&skin=0

howardwang

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。

v22

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

v22

哦，谢谢