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标题: 求助OG12, CR 78 雷达监测仪和超速那题 [打印本页]

作者: ylp2012 时间: 2012-8-28 15:31
标题: 求助OG12, CR 78 雷达监测仪和超速那题
为毛选B呢……求分析谢谢！！

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.

作者: ylp2012 时间: 2012-8-30 19:31

作者: qaplwz 时间: 2012-8-31 03:21
此题说。这个地方只有3%的车有测速雷达，但是收过超速罚单（只是超速过的）的车中33%是安装了雷达了的。——》CLEARLY。有雷达的车司机有更大的可能经常性超速（经常regularly)相比于没安装雷达的。

这是一个ASSUMPTION题。而且是gap。premises和conclusions之间明显有gap，答案需要填补gap。我认为关键是regularly这个词。
PREMISES只是说被给过罚单的车33%有雷达。而结论就是有雷达的车更大可能REGULARLY超速。
B答案被给过超速罚单的人比没接受过罚单的人更有可能经常性超速（完美填补了GAP，受罚单到REGULARLY的gap）

作者: ylp2012 时间: 2012-8-31 17:19
谢谢LS！！好人有好报啊！！

做逻辑题的感觉果然还是不到位，总觉得自己的思路没有调成gmat的频道……捉急……

作者: qiuqi 时间: 2012-9-10 00:58
My understanding is, B ensures that the tickets are issued to the right persons. If a driver sped 10 times without getting a ticket, while a driver only sped once and got a ticket, then the "conclusion" is not conclusive.

作者: fifiwong 时间: 2012-12-16 17:41

此题说。这个地方只有3%的车有测速雷达，但是收过超速罚单（只是超速过的）的车中33%是安装了雷达了的。——》CLEARLY。有雷达的车司机有更大的可能经常性超速（经常regularly)相比于没安装雷达的。

这是一个ASSUMPTION题。而且是gap。premises和conclusions之间明显有gap，答案需要填补gap。我认为关键是regularly这个词。
PREMISES只是说被给过罚单的车33%有雷达。而结论就是有雷达的车更大可能REGULARLY超速。
B答案被给过超速罚单的人比没接受过罚单的人更有可能经常性超速（完美填补了GAP，受罚单到REGULARLY的gap）

-- by 会员 qaplwz (2012/8/31 3:21:39)

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