GMAT培训 每日一题-逻辑第41题

Installing scrubbers in smokestacks and switching to cleaner-burning fuel are the two methods available to Northern Power for reducing harmful emissions from its plants. Scrubbers will reduce harmful emissions more than cleaner-burning fuels will. Therefore, by

installing scrubbers, Northern Power will be doing the most that can be done to reduce harmful emissions from its plants.

Which of the following is an assumption on which the argument depends?

(A)Switching to cleaner-burning fuel will not be more expensive than installing scrubbers.

(B)Northern Power can choose from among various kinds of scrubbers, some of which are more effective than others.

(C)Northern Power is not necessarily committed to reducing harmful emissions from its plants. 

(D)Harmful emissions from Northern Power's plants cannot be reduced more by using both methods together than by the installation of scrubbers alone.

(E)Aside from harmful emissions from the smokestacks of its plants, the activities of Northern Power do not cause significant air pollution.

题目分析：原文谈的就是两种方法那种对于减排更有效。问假设。A说这两种方法哪个更贵，没提，杀。B说这个工厂能决定用哪种scrubber，因为某些scrubber更有效，没提，杀。C说这个工厂没有义务减排，有没有义务扯得很远了，杀。D说减排的任务不能两个方法都用，原文谈不是用A就是用B，这个选项说之所以原文这么谈，是因为原文假设不能两种方法同时用，还是比较通顺的，留着。E说除了emission，这个工厂就不会造成很多污染了，文章谈的就是如何减少emission，这个选项没有谈emission，明显跑题，杀。