求解答 PREP12 CR18 为什么不选A呢

llwd

Airport official: Local residents have been complaining that night fights into Plainsville airport disturb their sleep and should be sharply reduced in number. This complaint is completely unreasonable—there have been night flights coming into the airport from the very beginning, twenty years ago, and these residents should have taken that fact into account when buying their homes.
Which of the following is an assumption on which the airport argument depends?
A. There are fewer night flights now than there were originally.
B. The residents who are complaining have been in their current homes fewer than twenty years.
C. The residents who are complaining are ignoring the benefits they gain from the presence of the airport.
D. The economic success of the airport depends entirely on the existence of the night flights.
E. People buying houses in Plainville all avoid buying houses near the airport if they can.
Reasoning
In order to adequately support the arguments conclusion, what piece of information must be an implicit part of the argument? The conclusion of the argument is residents’ complaints about night flights that disturb their sleep are unreasonable. The officials point is that if the residents chose to move into an area with noisy night flights, they cannot reasonably complain about those flights. But this presupposes that the area already experienced noise from night fights when the residents moved there; that the residents knew or should have known about the noise when they bought their homes; and that they could have chosen to live elsewhere. Therefore, look for an answer option that expresses or follows from one or more of these assumptions.
A. The point could make sense even if the frequency of night flights hasn't changed.
B. Correct. As explained above, the argument presupposes that the night flights were already happening when the complaining residents first moved to the area; since the night flights started twenty years ago, the argument assumes the residents moved there less than twenty years ago.
C. Even if the residents acknowledged the benefits they gain from the airport, their complaints about the night flights might still be unreasonable.
D. Even if the airport could scrape by without night flights, the residents’ complaints about the night flights might still be unreasonable.
E. Without assuming this, the argument would still be successful--for example, even if it included the information that no homebuyers who can avoid buying houses near the airport do so.

llwd

额 之前一直把选项B的意思看错了 真为自己智商捉急

lisakikiqi

我也是选了A，我不懂为什么是B？？我也不太懂B的意思，求指教

DeliciaAn

Airport official: Local residents have been complaining that night fights into Plainsville airport disturb their sleep and should be sharply reduced in number. This complaint is completely unreasonable—there have been night flights coming into the airport from the very beginning, twenty years ago, and these residents should have taken that fact into account when buying their homes.
Which of the following is an assumption on which the airport argument depends?
A. There are fewer night flights now than there were originally.
B. The residents who are complaining have been in their current homes fewer than twenty years.
C. The residents who are complaining are ignoring the benefits they gain from the presence of the airport.
D. The economic success of the airport depends entirely on the existence of the night flights.
E. People buying houses in Plainville all avoid buying houses near the airport if they can.

Assumption题可以用取非削弱的方式来做：
飞机场工作人员说：当地居民抱怨飞机。这个抱怨不合理，因为飞机场20前就建好了。这些居民在买房子的时候就应当考虑飞机场可能会带来的一些问题。
A: 比最开始，现在的晚上的飞机要少。没啥关系。因为少还是不少，对于居民抱怨没有必然联系。多了，有声音，少了也是有声音的，原文没给，少了，人们会抱怨少，多了，人们抱怨多。而且用取非方式，给A选项取非－>there are more night flights now.现在比过去飞机多，这好像对于原文论证也没啥影响。注意做逻辑题目的时候，忌把个人观点放进来。
B. 抱怨的居民住在他们的房子里少于20年。取非：抱怨的居民是已经住在这里超过了20年的。这就将offcial的argument的削弱了，因为official说这些居民在买房子的时候就应当考虑飞机场可能会带来的一些问题，然而这帮人在20年前就已经买了房子了，20年前买，又不知道以后会不会盖飞机场。所以削弱了official的论证。