OG13 CR67

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

这个题选E。我的疑问在于OG对于A的解释。为什么A削弱了结论？？OG原话：For if fossil fuels are used to produce the electricity now used by the industries and if it is because of these newer technologies that output has increased, the arguement's conclusion is less likely.

buchart

hemodata 发表于 2013-7-5 18:50
原文的结论说，由于部分生产转而用电，因此用燃料量减小了。其中暗含的假设是，生产总量在转变前后没有变化 ...

machinary 是一次性投资， 用电量是持续的。 如果造一个用电的机器这个过程比较省油， 但是一旦开工每一度电耗油很大， 那么整体耗油就很大。

JasonY

请问大神们 B选项为什么不对 不太懂

hemodata

原文的结论说，由于部分生产转而用电，因此用燃料量减小了。其中暗含的假设是，生产总量在转变前后没有变化。因此，如果生产量实际增长了，由于增长部分是在哪种机器（新旧）生产的不确定，舅不能得出原文的结论了，因为消耗量有可能是增长的。