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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.
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！
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