※ 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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