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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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[求助]再问问OG-113

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楼主
发表于 2005-6-22 11:39:00 | 显示全部楼层

我原本和楼主想法一样,也正准备发贴问,但是后来一看题目和选项就明白了D没有削弱作用。

原文的结论是要减少delay->more of takeoff and landing slots at the busiest airports must be allocated to commercial airlines(分配给商业航空公司的更多的slots)

但是D After a small Midwestern airport doubled its allocation of takeoff and landing slots, the number of delays that were reported decreased by 50 percents.是说slots增加了,delay减少了。由于没有说明,那么在总的slots增加的同时,分给商业航空公司的slots可能增加也可能减少。所以不能对原文的结论构成削弱也不能构成支持

但我还有有一些疑问,如果D是说在Midwestern airport doubled 给商业航空公司分配更多的slots,是delay下降了,能支持原结论吗?这种结论是A用B方法能达到目的C,能用选项D用B方法也能达到目的C支持吗?


[此贴子已经被作者于2005-6-22 11:55:13编辑过]
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