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 level of output is held constant.

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


The first identifies the content of the conclusion of the argument; the second provides support for that conclusion.

The first provides support for the conclusion of the argument; the second identifies the content of that conclusion.

The first states the conclusion of the argument; the second calls that conclusion into question.

The first provides support for the conclusion of the argument; the second calls that conclusion into question.

Each provides support for the conclusion of the argument.

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考题讲解

情景：Delta公司最近从烧油的老技术换成了耗电的新技术。问题是是否能得到这样的结论：在产出一定的情况下现在比以前用油量更少。显然，回答是肯定的，因为在产出一定的情况下，发新技术用的电所需的油比老技术所用的油量少。

推理：第一个黑体字是一个既定事实，也是推理文段的前提。第二个黑体字可以被认为是推理文段的主结论。

选题方式：略

选项分析：

A选项：第一个黑体字指出论证主结论的内容；第二个黑体字提供了对该结论的支持。两个黑体字的作用搞反了。

B选项：Correct. 第一个黑体字提供了对论证主结论的支持；第二个黑体字指出了该结论的内容。

C选项：第一个黑体字表明了论证的主结论；第二个黑体字削弱了主结论。第一个黑体字是前提，不是结论，第二个黑体字也没有削弱第一个黑体字。

D选项：第一个黑体字提供了对论证主结论的支持；第二个黑体字削弱了主结论。第二个黑体字没有削弱第一个黑体字。

E选项：两个黑体字均支持了论证的主结论。第二个黑体字就是主结论。

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