扫描二维码，直接登录
题库 / Prep2007E2-CR-57
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?
The major causes of delays at the nation's busiest airports are bad weather and overtaxed air traffic control equipment.
Since airline deregulation began, the number of airplanes in operation has increased by 25 percent.
Over 60 percent of the takeoff and landing slots at the nation's busiest airports are reserved for commercial airlines.
After a small midwestern airport doubled its allocation of takeoff and landing slots, the number of delays that were reported decreased by 50 percent.
Since deregulation the average length of delay at the nation's busiest airports has doubled.
方案无法影响到主因，原文方案：more of the takeoff and landing slots at the busiest airports must be allocated to commercial airlines，即本方案可以影响到事件发生的主因继而解决DELAY的问题，
A选项：我特么DELAY发生的主要原因就是个不可抗力（坏天气）以及overtaxed air traffic control equipment（他因）你特么再瞎倒腾都没用，你的方案根本没有影响到我任何一个主因
since这里是自从的意思，不是因为。因为since后面跟的是名词，而不是整个句子。since表“因为”是连词后面跟句子，since表“自从”是介词后可跟名词。
由此可知，题目原文并没有说deregulation of airlines 是造成delays的原因，所以A选项并不与原文矛盾！
登录 或 注册 后可以参加讨论
我来解释一下C为什么不对，选C觉得有weaken的同学是这样想的：“高达60%的航道已经分给了commercial airline\" ---“再多分点变成70%也不会对总的delay有缓和作用“
C选项错在没有对60%这个数字表态，它没有说60%已经很高了这个意思，也没有暗示把它变更高成70% 会不会缓和delay这件事。这个纯属于作者态度问题，作者既然没有给出态度词，我们就不能over-interpret。这个和市长要收进城费那道题很像，只不过那道题正确答案给出了态度：“already“
相对最好的答案。勉强归为第一类，方案实施了但因为不是主要原因所以达不到效果。
Since不是因为，是自从。。