请教大家费费逻辑的一道题

liulu007

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? C
(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.
正选是c,是按not加weaken猜得，但是不明白C是怎样否定后削弱结论的，请大家指教

gdboy8888

那请问第一句话说它干嘛呢？跟human failure有什么关系？能不能请你翻译一下这句话呢？感激不尽~~！！

liulu007

谢谢LZ，看来还是阅读有问题，其实不难的句子看得云里雾里的，^_^

socat123

就是说：报道的fatal airplane crash last August　increase,的原因是new and more stringent rules for identifying and reporting mechanical problems，而不是 Mechanical problems in airplanes 实际上增长了50％　。那么就要选C喽