FeiFei-61题，在连接里面没有解释，求助！-->bigmouse转移

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.

(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.

能帮我分析这道题目的答案是如何推理的吗？

答案：C。

根据答案倒推：

      因为：报告机械故障的增加了50％

      结论：new and more stringent rules 是有效的。

所以假设：不是因为机械故障本身提高了50％而提高了报告量。隐含的意思正是这个rules 的作用。

这样理解对吗？

为什么我一看答案，自然就选了D。感觉D有道理呀。

请教nn这道题D错误的理由。我和blackhorse gg 一样，也选了D.

D说，机械师比以前更加愿意（少勉强）报告机械故障了。这是不是说：报告频率高还是机械的缘故，而不是加强纪录和汇报的缘故？

所以说是weaken了new rules 是有效的这个观点。是错的。

我的理解对不对啊？