GMAT逻辑题练习及答案(372)

2017-09-06 09:57

来源：新东方在线

作者：

　　GMAT逻辑题目:

　　Photovoltaic power plants produce electricity from sunlight.As a result of astonishing recent technological advances, the cost of producingelectric power at photovoltaic power plants, allowing for both construction andoperating costs, it one-tenth of what it was 20 years ago, whereas thecorresponding cost for traditional plants, which burn fossil fuels, hasincreased. Thus, photovoltaic power plants offer a less expensive approach tomeeting demand for electricity than do traditional power plants.

　　The conclusion of the argument is properly drawn it whichone of the following is assumed?

　　A. the cost ofproducing electric power at traditional plants has increased over the past 20years.

　　B. Twenty years ago,traditional power plants were producing 10 times more electric power than werephotovoltaic plants.

　　C. None of therecent technological advances in producing electric power at photovoltaicplants can be applied to producing power at traditional plants.

　　D. Twenty years ago,the cost of producing electric power at photovoltaic plants was less than 10times the cost of producing power at traditional plants.

　　E. The cost ofproducing electric power at photovoltaic plants is expected to decreasefurther, while the cost of producing power at traditional plants is notexpected to decrease.

　　参考答案：D

　　思路：

　　A. is incorrect because it tells us about only one of the two costs, not about how the two were related 20 years ago. It in effect restates premise 2, and premises 1 and 2 together are not sufficient for drawing the conclusion.

　　B. is incorrect. The amount of electricity produced by the different kinds of plants is not at issue.

　　C. is incorrect. While it is relevant tothe discussion, (C) does not provide the information about the comparative costs of the two kinds of plants 20 years ago that allows the conclusion to be properly drawn.

　　D. is incorrect because the conclusion in the argument is about the present only. Whether or not the change described in

　　E. is expected to take place has no bearing on the claim in the conclusion that the one kind of plant offers a less expensive approach at present.

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