[求助]一道争议题GWD15-Q32

Q32:

Delta products, Inc., has recently switched at least partly from older technologies using fossil fuels to new technologies powered by electricity.  The question has been raised whether it can be concluded that for a given level of output, Delta’s operation now causes less fossil fuel to be consumed than it did formerly.  The answer, clearly, is yes, since the amount of fossil fuel used to generate the electricity needed to power the new technologies is less than the amount needed to power the older technologies, provided that the level of output is held constant.

In the argument given, the two boldface portions play which of the following roles?

1. The first identifies the content of the conclusion of the argument; the second provides support for that conclusion.
2. The first provides support for the conclusion of the argument; the second identifies the content of that conclusion.
3. The first states the position that the argument opposes; the second states the conclusion of the argument.
4. Each provides evidence that calls the conclusion of the argument into question.
5. Each provides support for the conclusion of the argument.

   Answer: AE

有争议的一道题，我还是觉得A很对，请高手指点

個人想法，請參考:

A.前句指出此argument"結論"的內容,但其實應為"事實"

關鍵字:has recently switched現在完成式表示事實

      (事實應用來支持結論，而其本身並非結論)

個人想法，請參考:

A.前句指出此argument"結論"的內容,但其實應為"事實"

關鍵字:has recently switched現在完成式表示事實

      (事實應用來支持結論，而其本身並非結論)