[求助]og12-43

judyenglishS

43.  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
============================================
为什么选D呢？我怎么觉得它weaken了TOT

linmeimei

谁能帮忙解答下BC选项，看不懂答案解释，干吗要用even if来解释啊

judyenglishS

谢谢。
哎……我D理解错了orz

hangtianyuan

其实这里包含了一个false dilemma 为什么一定要二选一 两个都选可能效果更好，而D选项就是排除这种可能，只有这样才能说明你用S能最大程度减小.....

hangtianyuan

这是一道假设题，你对选项去非如果是削弱原文 那么该项就是答案