脆求解一道狒狒逻辑题~~

122. Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, it one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

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

(A) the cost of producing electric power at traditional plants has increased over the past 20 years.

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

(C) None of the recent technological advances in producing electric power at photovoltaic plants 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 10 times the cost of producing power at traditional plants.

(E) The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.

我选A, 答案是D ,求求大虾们帮下忙,就要考试了,心里很急,谢谢

前提:A 工厂的生产成本是 B 工厂20年前的1/10

结论:A工厂比B工厂更经济实惠的一种方法

问假设:20年前A工厂的花费就比B工厂低 那么多

A答案错误,因为B工厂成本20年来提高了,那A 工厂呢,提高了还是降低了?没有明确给出相关信息,所以无法得出结论

(类比的时候假设往往说明两个是相同的,或者相同条件下比较从而得到的结论)要善于分析做题的方法,而不是死扣答案