求助!feifei-61

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.

变态题

结论：last august，crash不是人为问题。

论据：有新的严格的措施出来，机械的问题报告增加。

问assumption：

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）

feifei

是LSAT题

不明白...

能再详细一点么 谢谢

俺试着解释一下，积极参加讨论。。。

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

lsat第一套的题：

这是其他人的解答

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。