Because mining and refining nickel is costly, researchers have developed an alternative method for e...

题目信息

Because mining and refining nickel is costly, researchers have developed an alternative method for extracting nickel using Streptanthus polygaloides, a plant that absorbs and stores nickel from the soil as it grows. The researchers incinerated a crop of Streptanthus they grew in nickel-rich soil. By chemically extracting nickel from the ash, they produced 100 pounds of nickel per acre of land at a total cost per pound slightly above that of current mining.

Which of the following, if true, most strongly supports the conclusion that the use of Streptanthus to extract nickel will be commercially adopted?

A:The season in which the researchers grew Streptanthus was an unusually favorable one, with the right amount of precipitation to maximize the growth rate of Streptanthus.

B:Because lowering the concentration of nickel in the soil can make land much better for agriculture in general, a plot on which Streptanthus has been grown and harvested can be sold for substantially more than it cost.

C:More air pollution is generated for each pound of nickel produced by extracting it from Streptanthus than is generated using conventional mining and refining.

D:The land on which the researchers planted Streptanthus was unusually free of the various weeds that can compete with Streptanthus for water, nutrients, and sunlight.

E:It is extremely rare for soil to contain higher concentrations of nickel than the concentrations present in the researchers' experimental plot.

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正确答案： B:Because lowering the concentration of nickel in the soil can make land much better for agriculture in general, a plot on which Streptanthus has been grown and harvested can be sold for substantially more than it cost.

因为mining and refining 镍花费高，研究员发明了另一种提炼镍的方法就是利用S植物提炼，这种植物可以从土壤里吸收和保存镍。研究者种植了s在镍很丰盛的土壤里。与通过化学方法提取镍比较，他们用植物吸收产生没英亩100pounds总花费稍高于现在的mining方法。求support,用化学方法更好。

A.研究者种植S在一个不寻常的很好的season，植物s的增长率是最大化的。杀，没有帮助。

B.因为减少土壤里镍的储存可以使land更适合于农业，实验室通过植物s方法获得镍可以卖取比其实际花费更高的钱。很明显，support，虽然cost高，但是卖了比cost更多的钱==

笔记