[求助]OG上一道题

ypurple

    

171. A recent report determined that although only three
percent of drivers on Maryland
highways equipped their vehicles with radar detectors, thirty-three percent of
all vehicles ticketed for exceeding the speed limit were equipped with them.
Clearly, drivers who equip their vehicles with radar detectors are more likely
to exceed the speed limit regularly than are drivers who do not.

    

The conclusion drawn above depends on which of the
following assumptions?
                

    

(A) Drivers who equip their vehicles with radar detectors
are less likely to be ticketed for exceeding the speed limit than are drivers
who do not.

    

(B) Drivers who are ticketed for exceeding the speed
limit are more likely to exceed the speed limit regularly than are drivers who
are not ticketed.

    

(C) The number of vehicles that were ticketed for
exceeding the speed limit was greater than the number of vehicles that were
equipped with radar detectors.

    

(D) Many of the vehicles that were ticketed for exceeding
the speed limit were ticketed more than once in the time period covered by the
report.

    

(E) Drivers on Maryland
highways exceeded the speed limit more often than did drivers on other state highways
not covered in the report.

    

171.

    

The conclusion concerns regularly exceeding the speed
limit, but the data derive from isolated occasions when drivers exceed the
speed limit and are ticketed. The conclusion thus assumes that these instances
provide evidence of regular behavior-that drivers ticketed for exceeding the
speed limit are likely to be drivers who regularly exceed it. Choice B states
this assumption and is the best answer.

    

Choices A, C, and D provide additional data that might be
relevant to the conclusion, but if choice B is assumed, the additional data are
unnecessary for drawing the conclusion. The difference that choice E describes
between Maryland
and other states would simply suggest that the report’s findings cannot be
extrapolated to other states. It does not help in drawing the conclusion.

    

Assumption: 如果受到罚单的就是经常开快车的，那么结论成立

    

MingLiU","serif"; color: red;">此题中有一个gap,MingLiU","serif"; color: red;">是概念的跳跃,MingLiU","serif"; color: red;">原文通过说明装radar detectorMingLiU","serif"; color: red;">的在所有车的比例和被ticketMingLiU","serif"; color: red;">的车的比例得出装RDMingLiU","serif"; color: red;">的人经常超速. MingLiU","serif"; color: red;">这里的两个概念是ticketedMingLiU","serif"; color: red;">和regularly
exceed speed limit.MingLiU","serif"; color: red;">由两个数据我们可以直接得到(MingLiU","serif"; color: red;">无需任何隐含条件)的是:装RD的车更多的被ticket.而结论直接将ticket和regularly
exceed speed limit联系在一起,这就是概念上的跳跃,需要一个assumption将两个概念联系在一起,即B

这道题很不理解，ticketed不就是exceed speed limit吗，B起了什么作用？
谢谢帮助