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. 我认为:自专家排除人为因素后,一系列检验机器故障的更严格的标准出台,正说明飞机事故
是由机器故障引起的,所以选b. 可答案是c.
牛牛们怎么看？
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