急！！！一道逻辑题，望高人指点迷津的说！

Jessica

OG上的题目，171题，答案是B. 不知何故。望高人指点迷津的说！

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.


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lala

我来说两句，其实A是一个很迷惑人的选项。 它说：安了雷达的司机比没安雷达的司机不容易被开罚单。如果A成立，结论更能成立。但为什么不选它呢？因为A不是成立的必要条件。如果把A进行否定--"安了雷达的司机和没安雷达的司机一样容易被开罚单"，结论仍能成立。所以，A只是一个支持选项，B才是正确答案。 当然，直接看出B最好。

licheng

SIMILAR 不等于说 意思相同，
所以要加以区分，
另外
你的思路很正确，
就是要提高速度了：）

Jessica

大哥，看来我还是未完全理解，再麻烦请教一下：

您是否是这个意思：

(1) 3% drivers have R.D.
(2) 33% ticketed have R.D.
so, we can infer: (3) drivers with R.D. are more likely to be ticketed than w/o R.D.

(4) —conclusion: drivers with R.D. are more likely to speeding regularly than w/o R.D.

(3) and (4) are already very similar, except the word "ticketed" vs. "speeding regularly"

If the following is true:

(5)- Choice B: drivers ticketed are more likely to speeding regularly than drivers not ticketed.

then drivers with R.D. are more likely to speeding reguarly,  AND
drivers w/o R.D. are less likely to speeding regularly.

In other words: (3) + (5) => (4)

高手大哥，这个分析对吗？

licheng

不是啊，去掉RADAR的话，这个逻辑完全不能通了

Jessica

偶觉得这道题目也挺损的，radar detector 原来是个干扰项....(

Jessica

谢谢高人大哥指点，大哥辛苦了，万分感激！

licheng

你好，JESSICA，
我来说两句

这样的体型是很明显的找桥题目。
简单地说，就是知道 A=》B，C=》D问ASSUMPTION，就是要找个B=》C的。

来看这道，

A是什么？
only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors
B是什么？
33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them
A和B合起来，是个现象，还没有任何推理。所以当中不可能存在遗漏的ASSUMPTION。
再开C
drivers who equip their vehicles with radar detectors
这个是结论的条件，就是说：
如果有这样的司机，那么。。。
D（are more likely to exceed the speed limit regularly than are drivers who do not. ）
更容易会犯超速的错误。
好，A，B中没有遗漏，那么B，C中有没有？
C是个现象，所以也没有。
那么唯一可能有遗漏的地方就是D中，
从B中的TICKETING到D中的MORE LIKELY就是一个突破点。

有些时候很容易认为这是显而易见的嘛。。。
其实不然，你如果换个思路，比如说把LIKELY TO EXCEED SPEEDLIMIT换成LIKELY TO EARN HIGH SALARY（换一个常人不认为是常理的事情），你就会很简单地看见，哦，确实遗漏了一个ASSUMPTION，

那就是你的选择支 B