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Since the deregulation of airlines, delays at the nation's increasingly busy airports have increased by 25 percent.To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commercial airlines.

Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?

正确答案: A

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楼主
发表于 2013-9-19 10:47:08 | 只看该作者 回帖奖励 |正序浏览 |阅读模式
Since the deregulation of airlines, delays at the nation's increasingly busy airports have increased by 25 percent.To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commercial airlines.

Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?
  • AThe major causes of delays at the nation's busiest airports are bad weather and overtaxed air traffic control equipment.
  • BSince airline deregulation began, the number of airplanes in operation has increased by 25 percent.
  • COver 60 percent of the takeoff and landing slots at the nation's busiest airports are reserved for commercial airlines.
  • DAfter a small Midwestern airport doubled its allocation of takeoff and landing slots, the number of delays that were reported decreased by 50 percent.
  • ESince deregulation the average length of delay at the nation's busiest airports has doubled.
答案是A
我选了B,我的思路可能有些奇葩,我是这样想的:B中说管制撤销后,运营的飞机数量增加了25%。这样以来,不是可以理解为既然总的飞机数量增加了,所以导致飞机场要起飞的飞机更多了,commercial的飞机也更多了,即使多分配一点给commercial airlines,也一样会delay?
求G友们解释一下我的奇葩思路哪里有问题?
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板凳
 楼主| 发表于 2013-9-19 15:13:56 | 只看该作者
sdcar2010 发表于 2013-9-19 11:56
You do not know whether the number of national busy airports has increased or not. Further, you do n ...

谢谢sdcar,也就是B我自己进行了主观推理,自己yy了一些条件吧。非常感谢~
沙发
发表于 2013-9-19 11:56:11 | 只看该作者
You do not know whether the number of national busy airports has increased or not. Further, you do not know whether the newly added airplanes LANDED or TOOK OFF from the national busy airports! All the added airplanes might mostly fly between those remote and less visited airports. Further, the added planes might ALL belong to non-commercial flights. In other words, you need an extra condition to make B a legitimate and reasonable explanation of the increased delays to defeat the state proposal/conclusion.

A, on the other hand, gives an alternative, DIRECT reason to explain the stated premise and weakens the stated conclusion. No extra condition is needed.
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