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61. 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.

(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.

答案是C,想了半天也没弄明白为什么.....

希望各位XDJM 帮忙,把逻辑推理过程讲解一下,现在逻辑混乱中....

谢谢!!!!!

the new and more stingent rules resulted in a higher frequency of mechanical problems reported. That means many mechanical problems were not reported before the new rule was implemented, so we can conclude that the mechanic failure of the airplane might be the cause behind the crash.
But if the higher number of mechanical problems only occured after the new rule was in place, we know that old rule might not be problematic, so the conclusion that the crash was not caused by human failure is weakened.

C：其实机械问题没有增加50％.
即其实还是人为的原因。（机械问题报告增加50％是一个假相）

题目说的是因为检查更严格了，导致报告的增多。但是如果报告的增多是因为确实机械问题增多了，其原因也就不是因为检查严格了。 not weaken的他因削弱

典型的排除他因. 原文认为是严格的新规章使得mechanical problem被更多的检测出来. 言下之意是mechanical problem本身并没有同幅增长. 而C就是这个意思, 既不是因为mechanical problem本身增加了50%造成的. 这类题目的题干为:A-->B, assumption: 不是C-->B

题目问的是：new and more stringent rules account for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.

问的是新规定的作用。如果C 取非，就是事实上机械故障有50％的增加。说明这个规定可能没什么用。

我一直想知道：fatal不是人为造成的，那到底是什么造成的？这个题都没有说了啊

因为实际上50%不到的problems, 但是监测到的却超过50%, 这就说明是监测严厉所造成的, 这就成了原文的assumption了.

文章第一句话就是句废话，NND，扰乱视线，害得我东南西北都分不清了。