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题库 / OG12-CR-78
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?
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.
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.
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.
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.
Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.
其实这道题是非常经典的一道题，仔细分析有助于摸清逻辑出题的套路。
一开始说3%的车装电子狗，结果开罚单的车有33%都装了电子狗，是想说明装了电子狗和不装电子狗的车【开罚单】的几率不一样，不然开罚单的车应该也只有3%的是装了电子狗的。
题干下一句说，所以装了电子狗和不装电子狗的车【超速】的几率不一样。注意，GMAT的题干是不存在同意替换的！如果变了表达，几乎肯定会在两个表达覆盖的范围不同上出题。
所以显然，我们的正确选项必须将【开罚单】和【超速】的范围聚拢在一起。那就是B选项。
但这道题是可以通过排除法选出来的。A选项和正确答案正好相反。C选项说数量这和题目关注的百分比无关。D选项讲的是所有开罚单的车。如果是装了电子狗的车开罚单的次数不止一次，那这个选项也有说服力，但这里没有对装没装电子狗做任何区分，对解题没有帮助。E选项也同样，Maryland的车整体怎样对
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