GWD28－28？

hli6000

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.

我糊涂了。想想还是选E。哪位NN指点一下。

hli6000

顶！！！！！！！！！

howardwang

C.讨论过的.

ESeraph

以下是引用howardwang在2005-9-18 23:01:00的发言：

C.讨论过的.

Howard, where is the discussion post? ould you find the link? thanks.

howardwang

以下是引用ESeraph在2005-9-18 23:27:00的发言：

Howard, where is the discussion post? ould you find the link? thanks.

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=131710&replyID=&skin=0

后来，我还看到过lawyer NN的选择，那是在一个以“真题、或jj”问题目的讨论贴中。总共三个题目，其中，第二题就是这个题目。但是，具体我找不到了。你可以自己找找看。

ESeraph

Howard, thanks. i got it.

leohymo

Could you post the link? Thanks.