※ 引述《shyuan (.)》之铭言： : 23. On a certain day, nine scheduled flights on Swift Airlines were canceled. : Ordinarily, a cancellation is due to mechanical problems with the airplane : scheduled for a certain flight. However, since it is unlikely that Swift : would have the mechanical problems with more than one or two scheduled : flights on a single day, some of the nine cancellations were probably due to : something else. : The argument depends on which one of the following assumptions? : (A) More than one or two airplanes were scheduled for the nine canceled : flights. : (B) Swift Airlines has fewer mechanical problems than do other airlines of : the same size. : (C) Each of the canceled flights would have been longer than the average : flight on Swift Airlines. : (D) Swift Airlines had never before canceled more than one or two scheduled : flights on a single day. : (E) All of the airplanes scheduled for the canceled flights are based at the : same airport. : ans: A : 有点不是很清楚选项A的意思 : 先谢谢大家~~~ 以下是我的理解 否定选项A则原题结论不成立 也就是说若上述的九个行程不是由两台以上的飞机来飞,则不可能有除了机器故障以外 的原因导致取消行程 试想如果1台飞机飞九个行程,则该九个行程取消可能就是该飞机故障而非有其他因素造成 所以一定要有两台飞机以上,才会符合原题所说 some of the nine cancellations were probably due to something else --

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