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?
我原本对于B选项也有疑问,但看了以上讨论之后,豁然开朗。 题干讨论的是Power的问题,那种技术的power更省燃料;而B选项讨论的是manufacture the machinery in the new /old technologies。之所以迷惑,主要是因为提到了新技术所需的燃料比旧的少,但是它指的是制造机器的过程,与题干中的power无关,因此不选。
但是这里书上对B是这么解释的: 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. 我就真的不明白了,这个解释什么意思啊? 请指教!