求解og17 CR 654题

alicc

Although the discount stores in Goreville's cnetral shopping district are expected to close within five years as a result of competition from a SpendLess discount department store that just open, those locations will not stay vacant for long. In the five years since the opening of Colson's, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson's.

a.Many customers of Colson's are expected to do less shopping there than they did before the SpendLess store opened.
b.Increasingly, the stores that have opened in the centtral shopping district since Colson's opened have been discount stores.
c.At present, the central shopping district has as many stores operating in it as it ever had.
d.Over the course of the next five years, it is expected that Goreville's population wil grow at a faster rate than it has for the past several decades.
e.Many stores in the central shopping district sell types of merchandise that are not avalaible at either SpendLess Colson's.

没看懂这道题考得是那种逻辑,书后说是两种case的similarity，看了n遍解释还是没想明白。

咖啡印象

这个题目经常被讨论，在cd上了搜到了讨论后大多数人认同的解释，供LZ看看

conclusion: those locations will not stay vacant for long
now try to weaken this conclusion!!!

the only way the conclusion can be weaken in this case is if we can prove that we are comparing apple with oranges...

IMO B does that to perfection

根据LAWYER的weaken法，这种题属于类比题（discount 与non-discount），那关键就是要找出两者本质不同。

   2、再看看两者到底有什么不同。
（1）前面一部分是在讨论：discount倒闭是因为Spendless(discount)
（2）后面一部门是在讨论：stores倒闭时因为Colson(non-dicount)
注意，后面一部分的stores到底是discount还是non-discount，题目没有说，因此这里就是我们的突破点了！
   我们的目标是找出能够表明以上类比的两部分之间的不同之处。如果这些stores是discount的，那他们close是因为Spendless，而不是因为Colson咯，这就是选项B所说的！

   3、这道题实质就是：题目想用一个例子来证明另一个例子也会有相同的结果，因此我们所要做的就是说明两个例子的不同性

JeremyZhou

情景：虽然由于刚开业的SpendLess折扣店的竞争，Goreville中心地段的折扣店将在5年内关门，但这些地方不会空着。从非折扣店Colson开业起的5年内，每个关门的店铺处都有一个新店会开张。

推理：由于前提和结论讨论的事件相同，所以本题为类比推理。推理结构为：
前提：Colson倒闭店之后位置没空着。
结论：SpendLess倒闭店之后位置也不会空着。

选题方式：类比推理一共具有两个评估方向，要么提到Colson或SpendLess，要么给出与这两个案例相平行等价的案例C。

选项分析：

A选项：Colson的顾客现在在Colson购买的东西比SpendLess开业前更少了。本选项提及了两个类比对象，但是其和结论的相关性不大。

B选项：Correct. 在Colson开业之后开的店中，开起来的店都是折扣店。本选项指出了类比对象的区别，即，以前能不空着是因为可以开折扣店，现在开折扣店已经没用了。属于CQ1：相似性问题。

C选项：目前，商业中心的店铺数量跟以前一样多。本选项给出了类比对象的相似点，只能加强推理。

D选项：接下来的5年，Goreville的人口增长率将会比之前的十几年增加。如果人口增加，那么商铺更加不会空着了。

E选项：很多中心区商店的商品在SpendLes或Colson店都买不到。本选项没有提及类比对象的不同点。
答案来自于gmat.la 2017 og 654