不解PREP08-86题，求各位大神答疑解惑！

EricKwok

题目如下：

Which of the following most logically completes the passage?
Concerned about the financial well-being of its elderly citizens, the government of Runagia decided two years ago to increase by 20 percent the government-provided pension paid to all Runagians over 65.  Inflation in the intervening period has been negligible, and the increase has been duly received by all eligible Runagians.  Nevertheless, many of them are no better off financially than they were before the increase, in large part because __________.
A. they rely entirely on the government pension for their income
B. Runagian banks are so inefficient that it can take up to three weeks to cash a pension check
C. they buy goods whose prices tend to rise especially fast in times of inflation
D. the pension was increased when the number of elderly Runagians below the poverty level reached an all-time high
E. in Runagia children typically supplement the income of elderly parents, but only by enough to provide them with a comfortable living

此题答案选E，但我是选了C的，个人感觉C也是正确的叻。。。
逻辑笔记的解释是“老人们买了通货膨胀中涨的最快的物品。前提中已经提到，通货膨胀可以忽略不计，所以该选项不能评估题目中的因果推理。”
我就纳闷了，既然通货膨胀可以忽略不计，那么商品的实际物价是快速上涨的，那老人购买的话应该是会减弱经济状况才对啊？
此外OG13中有一道几乎一摸一样的题是选了类似答案（C）的。。。

实在不解，求各位答疑解惑！小弟感激不尽~~

airyun

顶一下，我也是看了OG再看这个题觉得匪夷所思的。。。然后当时是把OG上的按strengthen的考虑，也就是不需要100%为前提条件，只要有一点点支持成分就可以，然后把PREP86看做assumption，也就是结论为真的话，前提必须也为真，也就是逆前提得不出结论。。。可是后来我在GMATCLUB上发现了别个摘的Ron大神的话：
“The answer is by looking at the word that leads to the blank. This is the word that comes immediately  before the blank. If the word is since or because (like in the above argument) then you will definitely be  required to strengthen the author’s argument. Also the author’s conclusion will be in the sentence that  leads up to this word.
If the leading word/phrase is that or it should be expected that, then you will be required to make an  inference from the information provided in the stimulus. In these questions remember to avoid  extreme options and go with vaguely worded ones.
If the leading word is assuming that, then obviously you need to point out the assumption in the
argument and the conclusion will again be the last sentence that leads up to the blank.
If the OG13 is anything to go by, most Logical Conclusion questions will have a since or because at the end and hence will require you to strengthen the argument.”
我就彻底没辙了。。。

迟迟钟鼓

我觉得很清楚啊，C肯定不对，因为C超出了题干的讨论范围。
C说的是在in times of inflation， they buy goods whose prices rise especially fast.
但题干中说的是 Inflation in the intervening period has been negligible，也就是说C中讨论的情况是 out of scope的。

OG中原题题干的表述是annual rate of inflation since the pension increase has been below 5 percent
正确选项的表述是The prices of goods and services that meet the special needs of many senior citizens have increased at a rate much higher than the rate of inflation.

两道题目还是有很明显的不同的。

EricKwok

原来如此~看来是对题目理解有误了，感谢两位的解答~