Which of the following most logically completes the argyment?
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 hyphothesis that would gain support if______
A: histidine us 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 metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E:the concentraion of histindine in the growing herb declines as the plant approaches maturity.
答案是E.
迷惑的是D和A选项。我感觉这题是要加强hypothesis. 所以发现A似乎也对。
另外发现填空题错误率很高，没有找到很好的解题方法，各位NN有什么好的建议吗
自己顶一下
。。。。晕了，最后顶一次
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