OG13 逻辑67题求解

summerkui

67Several industries have recently switched at least partly from older technologies powered by fossil fuels to new technologies powered by electricity.

It is thus evident that less fossil fuel is being used as a result of the operations of these industries than would have been used if these industries had retained their older

technologies.

Which of the following, if true, most strengthens the argument above?

(A) Many of the industries that have switched at least partly to the new technologies have increased their output.

(B) Less fossil fuel was used to manufacture the machinery employed in the new technologies than was originally used to manufacture the machinery employed in the older tech

(C) More electricity is used by those industries that have switched at least partly to the new technologies than by those industries that have not switched.

(D) Some of the industries that have switched at least partly to the new technologies still use primarily technologies that are powered by fossil fuels.

(E) The amount of fossil fuel used to generate the electricity needed to power the new technologies is less than the amount that would have been used to power the older technologies.

这道题读不懂啊==

summerkui

为什么是选E呢？老技术用化石原料，新技术用电，怎么最后解释里 变成了用化石原料发电。。。这道题乱了乱了==

maestri

题目里涉及两种能源：矿物及电力；E选项所陈述的“矿物发电”这一情况如果我们不了解背景，那就将它作为一个事实，单纯接受就好。回到题目本身：

switch前使用的能源：100％矿物
switch后使用的能源：x%矿物＋(100-x)%电力（注意是partly from，所以一部分用矿物，一部分用电力）
要想使switch前的矿物>swicth后的矿物，可有如下方程式：

100%矿物>x%矿物＋(100-x)%电力，即(100-x)%矿物>(100-x)%电力。
那么只要新技术电力所需的矿物能源<老技术所需的矿物能源就可以了。

summerkui

maestri 发表于 2014-1-26 15:56
题目里涉及两种能源：矿物及电力；E选项所陈述的“矿物发电”这一情况如果我们不了解背景，那就将它作为一 ...

万分感谢！

pandrew

请问B选项错在哪里呢？？？

encorelee1223

pandrew 发表于 2015-5-5 23:05
请问B选项错在哪里呢？？？

请注意Less fossil fuel was used to manufacture the machinery里面的manufacture，不是说机器耗fossil少，是说制造机器用本身耗fossil少。

pandrew

encorelee1223 发表于 2015-5-6 16:57
请注意Less fossil fuel was used to manufacture the machinery里面的manufacture，不是说机器耗fossil ...

谢谢啦！