请教OG CR 82

天正

    

82.A recent report determined that although
only 3 percent of drivers on Maryland
highways equipped their vehicles with radar detectors, 33percent 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 drivers on other state highways not covered in the report.

这题做了几次  也看了答案  但还是不太明白   请教哪位N人可以指点一下   谢谢

stevegt

前提：only 3 percent equipped radar detectors

前提：33percent ticketed for exceeding the speed limit were equipped with them.

结论：drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not

这个地方有个gap 就是 被ticketed不一定就是爱超速的（不排除有那种运气霉的人，一年就超一次就被ticket了）所以答案就是要补全这个gap，就是B

sunday505

这个答案的解释给人误导.本题的核心不是generalization和specification的关系问题.原题的逻辑是:Since A----->B, So A-----C. 答案是Assumption is that B--->C holds.

cakemouse

我的理解是：原文中TICKET,SPEEDING LIMITE,EQUIP联系起来了，逻辑上有个错误：因为TICKET中有设备的占33％，装有设备的就一定喜欢超速嘛？逻辑错位可能存在于：有很多喜欢超速的没有被TICKET掉，逃掉了。为了把这个逻辑错误弥补掉，就反过来作为假设了。否定这个错误的存在。

我这样说不知道清楚不？

天正

好像不同的人有不同的理解      再品味一下   看能不能真正搞懂       谢谢LS各位

vinlle

我怎么觉得be likely to do，不是喜欢，而是更容易，更倾向于的意思啊？

我同意二楼的：

前提：only 3 percent equipped radar detectors

前提：33percent ticketed for exceeding the speed limit were equipped with them.

结论：drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not

但不同意gap 在于 likely，我认为gap 在于，结论中出现了一个 regularly，前提中没有这方面信息。

vinlle

从两个前提推出 equipped的人容易被ticketed，

补充一个ticketed的人容易 经常ticked（more regular），

于是就得到了结论， equipped的人容易 regular ticketed