搜不出来了，发新帖请达人分析T-3-Q37.

true

T-3-Q37.
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
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.

蓝的是我选的，红的是正确答案。
感觉什么正确答案和题干无关呢？题目讲的是烧木取矿，问支持。
正确答案什么读起来像在说卖地呢？

歪歪的

timclement 发表于 2011-2-26 11:33
D项是无关项啊，而且还有点削弱的作用。 因为这块什么什么的地是unusually free。。。。。的。说明这块地特 ...

这条很有启发呀！我原来选的D是作为这个方法的优点，确实没有看到researcher和commercial adopted之间有区别。确实是weaken~

笨蛋加油

注意啊问题问的是commercially adopted，我开始选A，仅仅支持计划可行，但并不说明经济上可以接受！正确答案为B，开始我寻思卖地干什么啊，计划可行的话当然要一直用地啊，但其实我的逻辑错了。。。地里的nickels数量是一定的，吸完了就少了甚至木有了。。。所以吸完了当然要把地卖了呀！所以B正确！！！

timclement

D项是无关项啊，而且还有点削弱的作用。 因为这块什么什么的地是unusually free。。。。。的。说明这块地特殊，不易推广，经济上不可行，削弱了论证

liuxiaoyin

恩，关键看问题问的是什么。。。。。。我以为原文有比较选项必有比较，看来也不一定~~
只有B直接与economic有关。

m8888302

up
其余几项都无关

葛佳

up

mobilecdpyn

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.
原文说：是否提取N，价格高不高
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. 说season如何 无关
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 说N的浓度，S价格和原文由关
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 说AIR POLLUTION无关了
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. 说WEEDS和S抢各种资源 无关
E.    It is extremely绝对化 rare for soil to contain higher concentrations of nickel than the concentrations present in the researchers’ experimental plot.

herosweet

问支持，commercial adopted我觉得就是要着眼于经济利益上。首先，LZ选的这个跟weed营养有关，跟是否cost benefit analysis无关。所以应该是无关选项。
而B的意思是，虽然这样的新方法，cost是有点高，但是从地的角度看它可以卖出好价钱，就cover掉了之前的cost。所以试行新方法还是有收益的。

希望这样可以给你帮助。