og13 cr67 大神求指点啊〜

stephaniew

67. Several 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 technologies.
(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.

答案是E项，可是E项为什么说fossil fuel generate electricity呢？older technologies powered by fossil fuel和new tech powered by electricity 应该新旧技术各自依靠的power不一样么？大神求指导啊！

jane.seeker

我觉得题目的意思是旧技术靠的是fossil fuel，新技术靠的是electricity，但是题目种隐藏了一个前提，就是electricity是要靠fossil fuel产生的，所以能不能减少fossil fuel的使用量就得比较旧技术所需的fossil fuel和electricity所需的fossil fuel

拧发条喵

Several industries have recently switched at least partly from older technologies powered by fossil fuels to new technologies powered by electricity. 几家工厂将部分以化石燃料为动力的旧技术更新为使用电力的新技术
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.
这说明了这些工厂使用新技术减少了化石燃料的使用

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.
新技术使用电力，而火力发电使用的化石燃料< 旧技术使用的化石燃料
如果旧技术要使用100吨燃料，新技术要100度电力，但如果发电100度需要花掉120吨燃料，结论就不成立，反之成立。

其实回答你的问题应该就是，火力发电。
新技术使用的电力，也是从化石燃料转化来的，等于加入了火力发电这一步骤。

个人意见。

stephaniew

jane.seeker 发表于 2013-8-12 15:53
我觉得题目的意思是旧技术靠的是fossil fuel，新技术靠的是electricity，但是题目种隐藏了一个前提，就是el ...

这样一说我理解了。可是自己第一次看题不知道电靠油生这个前提岂不是很吃亏。。。

stephaniew

拧发条喵 发表于 2013-8-12 16:04
Several industries have recently switched at least partly from older technologies powered by fossil  ...

谢谢。可是第一次看题根本没看出来火生电这个前提。不知道这个前提真的好亏啊。

拧发条喵

stephaniew 发表于 2013-8-12 16:10
谢谢。可是第一次看题根本没看出来火生电这个前提。不知道这个前提真的好亏啊。 ...

我第一次做也没想到 但是前面的选项都可以排除，看到E就想到 啊如果火力发电的话就是这个情况……
所以一开始不知道也没关系 看到选项再判断XD