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 problem

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 problem
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.

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 problem
在某一天,SWIFT航空公司取消了9个航班.正常情况下,航班取消是因为该航班安排的飞机出现机械故障.SWIFT公司一天之内一两架以上的飞机出现故障,这不大可能,所以很可能航班取消是别的原因造成的.
选的应该是这个：A、为9个航班安排的飞机多于一两架.
1.多于一两架飞机出现机械故障不大可能（文中给出）
2.9个航班被取消（文中给出）
作出“航班取消是别的原因造成的”这样的推论所需的假设就是
“为9个航班安排的飞机多于一两架”（文中未给出）
其他的都没有直接关系.

B把

D

D
某天，SWIFT航空公司取消了9个航班。正常情况下，航班取消是因为该航班安排的飞机出现机械故障。SWIFT公司一天之内一两架以上的飞机出现故障，这不大可能，所以很可能航班取消是别的原因造成的。
问题是：以上观点依靠的是以下的哪个假设？
因此应该选D,即SWift 公司以前从未在一天内取消超过一两次航班。...

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D
某天，SWIFT航空公司取消了9个航班。正常情况下，航班取消是因为该航班安排的飞机出现机械故障。SWIFT公司一天之内一两架以上的飞机出现故障，这不大可能，所以很可能航班取消是别的原因造成的。
问题是：以上观点依靠的是以下的哪个假设？
因此应该选D,即SWift 公司以前从未在一天内取消超过一两次航班。

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