OG16 113求解答@-@

hhcarol

113. Although the discount stores in Goreville’s central shopping district are expected to
close within five years as a result of competition from a SpendLess discount
department store that just opened, 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.
Which of the following, if true, most seriously weakens the argument?
(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 central shopping district
since Colson’s opened have been discount stores.(answer)
(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 will 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 available at either SpendLess or Colson’s.

没有看懂题干：作者argue的点到底是什么？没有搞懂S和C之间到底是什么关系TAT

alzn2765

你首先要正确的找到Conclusion是什么。然后才知道怎么削弱。

不过这是OG排名第一的大贱题，我看了不下100遍，用了1年的时间才突然看明白。明白之后，你就知道这题有多贱了。

hhcarol

我就是找不到他的conclusion是什么？大神求稍稍提示解析一下下！

hhcarol

我回去思考了很久，现在终于想通了，这其实可以用数学方法来解释，分享一下我的心得：

根据题目我们可以得出这样一个大概的方程式（不是严格按照方程的概念得出的，只是为了表明几个因素间的相关关系）：

f(vacancy)=a*x+b*SR 其中f(vacancy)就表示空位的数量，x表示核心因素如C store和 S store；SR表示 stores replacing others;
a和b都只是相关系数，在本题中没有涉及讨论
则题干的含义可以翻译为：因为 f(vacancy)=a*C+b*SR=0所以f(vacancy)=a*S+b*SR=0（其实在这里vacancy是个恒等于0的式子，不管啦，大概意思是这样，一不小心凌乱了数学）

即说S满足条件可以带入此方程中，换句话说S要等于C，也就是说它们性质是相同的

我们看一下正确答案B：说其实C和SR不同性质，所以f(vacancy)才等于0 即C=\SR（不等于）
然而我们看到S和SR都属于discount stores 即S=SR
那么S就不满足条件，不能带入这个方程里，也就是说这两个case是无法得出同样的结论的！

alzn2765

hhcarol 发表于 2015-9-1 11:16
我回去思考了很久，现在终于想通了，这其实可以用数学方法来解释，分享一下我的心得：

根据题目我们可以得 ...

你想复杂了，这题其实很简单。提示：往简单了想，往无聊了想。你觉得太难的题，就老外那智商能想明白？他们有这个数学思维，GMAT数学平均分可能才30分吗？老外的所谓“难题”，基本除了文字游戏，啥也没有。