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78. A recent report determined that although only 3
percent of drivers on Maryland highways equipped
their vehicles with radar detectors, 33 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.
前辈们给出过如下解释：
这题的结论是：Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.
B说的driver是总体，带雷达不带雷达的车都算在内了，怎么无关了呢？？....
条件1 3%的车装了radar
条件2 超速被开罚单的车中33%装了radar
结论 装radar的人比不装radar的人更likely to exceed the speed limit regularly
反问：如果那些没被抓的人更加容易超速呢？而这些人正好是没装雷达的？那结论就应该是没装雷达的人更容易经常超速 - 这正好和结论相反。
所以前提是：被抓的人比不被抓的人更加容易超速
但我的问题是，怎样就变成了反问？什-意思？怎样就推出反问这个结论了？
难道说反问的思路就是说当原文涉及到两种不同类型的事物A\B，题里的两个条件都说的是一方A了，结论涉及到两个东西的比较，那这道题的假设也得是比较？
还有，这道题如果按照你的方法进行反问，那就是说想两个B条件跟A条件相同出发点。然后就得出结论的反面假设。然后我再取非就可以对吗?? |
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发表于 2010-10-12 21:25:50
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