关于gwd那提soil是不是就是这次考的

yuling526

答案应该是b 吧

Becausemining and refining nickels is costly, researchers have developed analternative method for extracting nickels using Streptanthuspolygaloides, a plant that absorbs and stores nickel from the soil as it grows.The researchers incinerated a crop of Streptanthus they grow innickel-rich soil. By chemically extracting nickel form the ash, they produced100 pounds of nickel per acre of land at a total cost per pound slightly abovethat of current mining.
Whichof the following, if true, most strongly supports the conclusion that the useof Streptanthus to extract nickel will be commercially adopted?

1. 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.
   

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

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

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.

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

yuling526

Because mining and refining nickels is costly, researchers have developed an alternative method for extracting nickels using Streptanthus polygaloides, a plant that absorbs and stores nickel from the soil as it grows. The researchers incinerated a crop of Streptanthus they grow in nickel-rich soil. By chemically extracting nickel form 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?

  1. 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.
  2. Because lowering the concentration of nickel in the soil can make land much better for agriculture in general, a plot in which Streptanthus has been grown and harvested can be sold for substantially more than it cost
  3. More air pollution is generated for each pound of nickel produced by extracting it from Streptanthus than is generated using conventional mining and refining
  4. 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.
  5. It is extremely rare for soil to contain higher concentrations of nickel than the concentrations present in the researchers’ experimental plot.

yuling526

我又看了一下题目，是不是选D?

skyice九九

我觉得可能还是B好一点吧......D说研究者的土地特别好，这样的话就削弱了，我觉得

yuling526

对你说的对，我又仔细看了看题目，D没有涉及到应该是B 谢谢