求问这道题的B选项是怎么想出来的

熊猫阿竹

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?

• ADrivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not.  分析A选项
• BDrivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed.  分析B选项
• CThe number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors.  分析C选项
• DMany of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report.  分析D选项
• EDrivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.  分析E选项
  

正确答案：B



B选项的意思是因超速而被罚款的人比没被罚款的人更容易超速，可这个为啥是assumption啊？

求大神回复！！！

alzn2765

这题的意思没那么复杂。
举例：我说你总打嗝。除了证明你“打嗝”之外，我还得证明“总”吧？

这题同理：
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.

前提已经说了“33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them”，也就是把“drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit than are drivers who do not”给说了。那还剩什么？剩“regularly”呗。选项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.
这题完全不用推理，仔细读题而已。

alzn2765

newconcept123 发表于 2016-1-2 19:09
我来尝试回答一下吧：

assumption的神器是negation method,就是把选项取否定，然后看该选项是否weaken题干 ...

Negation Test只能用来确认答案，或者2选1，不能用来找答案，5个选项都Negate一次，时间都不够。

这题的意思没那么复杂。
举例：我说你总打嗝。除了证明你“打嗝”之外，我还得证明“总”吧？

这题同理：
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.

前提已经说了“33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them”，也就是把“drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit than are drivers who do not”给说了。那还剩什么？剩“regularly”呗。选项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.
这题完全不用推理，仔细读题而已。

熊猫阿竹

我明白你的意思了，取非之后是说因超速而被罚款的司机并不比未罚款的司机更容易超速，那也就是说因为安装雷达而超速这个前提是错的。但是你说的33%和3%的问题好像不太对，3%是说所有司机里装雷达的是3%，33%是说所有被罚款的司机里装雷达的是33%，这俩没啥关系吧

熊猫阿竹

newconcept123 发表于 2016-1-2 19:09
我来尝试回答一下吧：

assumption的神器是negation method,就是把选项取否定，然后看该选项是否weaken题干 ...

我明白你的意思了，取非之后是说因超速而被罚款的司机并不比未罚款的司机更容易超速，那也就是说因为安装雷达而超速这个前提是错的。但是你说的33%和3%的问题好像不太对，3%是说所有司机里装雷达的是3%，33%是说所有被罚款的司机里装雷达的是33%，这俩没啥关系吧

newconcept123

我来尝试回答一下吧：

assumption的神器是negation method,就是把选项取否定，然后看该选项是否weaken题干。
（assumption的作用，有了他，逻辑完整些，没了他，逻辑就完蛋）
对B用 negation method:
Drivers who are ticketed for exceeding the speed limit are NOT more likely to exceed the speed limit regularly than are drivers who are not ticketed.

如果超速的司机和平凡人一样，那么就只有3%的车辆会拿罚款，但事实是33%的车辆拿了罚单，所以weaken了。