※ 引述《shyuan (.)》之銘言： : 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 : 有點不是很清楚選項A的意思 : 先謝謝大家~~~ 以下是我的理解 否定選項A則原題結論不成立 也就是說若上述的九個行程不是由兩台以上的飛機來飛,則不可能有除了機器故障以外 的原因導致取消行程 試想如果1台飛機飛九個行程,則該九個行程取消可能就是該飛機故障而非有其他因素造成 所以一定要有兩台飛機以上,才會符合原題所說 some of the nine cancellations were probably due to something else --

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