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OG 12-CR 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
答案选E完全没有问题，我当时自己选的是E，不过后来分析选项的时候，
发现（B）也可以起到削弱作用啊，使用新技术生产使用的fossile fuel比使用老技术使用的少，
而答案的解释：it does not matter how much fossil fuel was used to manufacture the older techonoogies originally. That has no bearing on whether more fossil fuel would have been expended as a result of the continued operation of the industries if the partial switch to newer techonologies had not occurred.
不懂！
求NN解释，OG答案是什么意思以及为什么B不起削弱作用！
谢谢大家帮帮忙！
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