Fei fei Logic 61
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.
A. 文中第一句the fatal airplane crash last August已经客观存在，说明飞机旅行并非相当安全。与文中事实相反。
B. 用于识别和报告机械故障问题的更加严格的新规定已经生效，这才是the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August的真正原因。而B选项Mechanical problems in airplanes是它因，削弱结论。
C. 正确。“Mechanical problems in airplanes have increased by 50 percent since last August”是用他因来削弱结论，加上NOT，则是排除他因的假设。
D. 诉诸于航空公司的主观意愿，与过去相比较，都跟现在的情况无关。
E. become easier to detect无关词。
看过解释后仍不太理解，作者认为新法生效
是故障报告率增加50%的原因。我觉得如果题目问推论或者暗示，肯定是选C,但Assumption,是不是D更合适，
个人观点仅供参考哦。。
题目说了是新的标准account for事故报告的增加，这与人想不想报我觉得是没什么太大的关系的，新法前人们报的少是因为标准比较低，新法后的很多情况都不能被界定为事故。
其次，加NOT一看就知道C对的，因为如果事故（指新法前的标准的）上升了50% ，那么题目中新法account for事故报告增加就不一定成立了。因为其他的原因导致这种上升５０％的情况，可能并不是标准变化哦
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