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题库 / Prep2012-CR-18
Airport official: Local residents have been complaining that night flights 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?
There are fewer night flights now than there were originally.
The residents who are complaining have been in their current homes fewer than twenty years.
The residents who are complaining are ignoring the benefits they gain from the presence of the airport.
The economic success of the airport depends entirely on the existence of the night flights.
People buying houses in Plainville all avoid buying houses near the airport if they can.
机场附近的居民抱怨夜班飞机打扰了他们的休息。
conclusion：这些抱怨毫无理由。 premise：从20年以前开始就已经有夜班飞机，居民在买房的时候应该考虑到这些因素。问assumption
choice a, 现在的夜班飞机数量比以前更少。取非：现在的数量和以前持平甚至更多，无法削弱conclusion
choice b, 抱怨的居民们在现在的房子里入住时间少于20年。correct，取非，抱怨的居民们在房子里的时间等于或者多于20年，说明入住的时候还没有夜班飞机，所以对他们的指责就不成立了
choice e, 所有买房的居民都避免购买机场边上的房子。取非，一部分居民避免买在机场边上。说明还有一部分并不在介意房子买在机场边上，说明他们不在乎位置带来的不利因素。无法削弱conclusion
谢谢解释！很清楚
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