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
答案选C,个人感觉C是无关选项。
In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.
If the statements above are true, then it is also possible that in
A. the number of days with heavy rainfall was lower in 1990 than in 1910
B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
D. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910
E. the average amount of rainfall per month was lower in 1990 than in 1910
答案选A，但是我觉得A肯定不对啊，moderate和light的天数都少了，只有heavy的天数多才能保证总降雨量变大了阿。。。
请指教，谢谢！
为什么没有NN回答我的问题
为什么没有NN回答我的问题
C是同因同果的类比加强
第二题 其实等于问must be wrong EXCEPT
A 不是肯定错 是可能错 也就是可能对
因为下雨天数少了 但是每次的雨量可以很大 注意题干中total rainfall (雨量)不要和 number of days (下雨的天数) 概念混淆
你问的第一个问题愿意是这样的：有一种植物是属于一个group里的，这个group里面的植物们都可以在金属浓度高的土壤中存活（其他植物则不能在此环境中生存）。研究发现这种植物可以产生H这种物质来让金属变惰性无效。因此有可能是这种植物产生的H导致它可以在浓金属土壤中生存的。问可以支持这个假设的选项。C说这个group里面的其他植物都产生H这种物质。C加强了H这种物质和高浓度金属中可存活性之间的联系。因此加强了假设。虽然不是必然结论，但是加强效果还是有的。
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