OG10-113

17．  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?

(A)  The major causes of delays at the nation's busiest airports are bad weather and overtaxed air traffic control equipment．

(B)  Since airline deregulation began，the number of airplanes in operation has increased by 25 percent.

(C)  Over 60 percent of the takeoff and landing slots at the nation's busiest airports are reserved for commercial airlines．

(D)  After a small Midwestern airport doubled its allocation of takeoff and landing slots，the number of delays that were reported decreased by 50 percent。

(E)  Since deregulation the average length of delay at the nation’s busiest airports has doubled

答案是A，看了解释以后我可以理解。但是C为什么不对呢？如果大部分的slots是commercial airlines的，那么说明delays是commercial airlines的责任，那么再分配给它们slots不能减少delays，不就most doubt on the effectiveness of the solution了嘛

不能这么理解吧，选项提供的是facts，并没有同时给出indication，所以你所理解的只是一种可能。

完全可以从另一个角度来理解，即当前的60＋还不够，起码要到80＋，因为题目并没有给出一个绝对的衡量标准。

反观A则是他因直接削弱，标准答案的风格。