这题的逻辑很像化学反应。 Analogy: premise 1: production of sulfur dioxide (an air pollutant): S + O2 ------> SO2 premise 2: the reaction won't happen without a catalyst X Conclusion: to prevent the production of SO2, we must isolate catalyst X. Weaken: attack premise 2, even without catalyst X, the reaction can still occur in some other ways (perhaps by some other catalyst or some specific T/P conditions). - This means that catalyst X is NOT even worthwhile, regarding our goal - the prevention of SO2 production. -This is what Choice D says. Choice E: "if catalyst X is present, other stuffs can also produce SO2." If this is true, we will be more convinced that catalyst X is important for the production of SO2, and thus we will support the author's conclusion that "to prevent the production of SO2, we must isolate catalyst X." Therefore, Choice E is essentially a strengthener, not a weakener. -- by 会员 babybearmm (2012/5/12 5:20:18)
。。。 姐姐的例子每次都是这么地道 当时我E纠结了好久 现在发现这种选项真的是常见的错误选项呢~~ 有例子更清楚啦。。直接复制粘贴走。。。嘻嘻。。>< |