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，请大家指教作者: socat123 时间: 2012-1-11 21:19
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喽作者: liulu007 时间: 2012-1-12 06:50
