3.5 北美

yangwu

回馈一下cd 有什么问题问我哈 昨晚太匆忙的打出来

myvalenti

感谢分享！               

thorn8

感谢babe～赞 equal to 和 the equivalent to 是adj.优于n.嘛？

Crystal_Chai

感谢分享！               

milliefairy

感谢分享！               

ztc199201290411

prep 的原题是哪个题目呀？

is456

prep 的原题是哪个题目呀？

gar_bbbbb

感谢分享！               

gar_bbbbb

楼主你好哦，只搜到了gwd的题。看看是不是这个？？感谢！！

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?


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 in which Streptanthus has been grown and harvested can be sold for substantially more than it cost  （正确答案）
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.

yangwu

gar_bbbbb 发表于 2016-3-7 04:57
楼主你好哦，只搜到了gwd的题。看看是不是这个？？感谢！！

Because mining and refining nickels is cost ...

sorry 说错了 对就是这道gwd 原题 选项都一样