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16. Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August. Which one of the following is an assumption underlying the argument in the passage? (A) Airplane travel is still relatively safe, despite the increase in reported mechanical problems. (B) Mechanical problems in airplanes have increased dramatically since last August. (C) Mechanical problems in airplanes have not increased by 50 percent since last August. (D) Airlines are less reluctant to report mechanical problems than they previously were. (E) Mechanical problems in airplanes have become easier to detect since last August. 答案：C。我错选成了答案D了。原题结论是八月份的致命飞机事故不应该归于human failure。因为自从那时起实行了新的更严格的措施来发现和和报告机械问题。这导致了机械问题的报告数量的频率增加了50%。我对这道题的理解是，报告的机械问题的增多不是因为机械问题确实增多了，而是因为由于更严格的检查报告措施让报告数量增多。D是说航空公司比以前更勇于报告机械问题了。因为即使措施更严格了，如果航空公司仍然和原来一样reluctant报告的话，那报告的增多就仍然要解释为机械问题确实增多了。为啥D不可以呢？请牛牛多多指教：） | 
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发表于 2009-7-15 06:30:00
