原题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.
为啥这个assumption容易被忽略，一个是思维惯性吧，我们可能会习惯于认为被抄牌的人爱超速的人大多数都是重合的，也就是我们习惯上就有这个take for granted 的假设。另外，还有个地方会让你忽略这个地方时，题目中说get ticketed 说的比较详细，说的是get ticketed for 超速，这样一来，我们就更容易把这个“get ticketed for 超速” 跟“爱超速”这个行为方式混起来了。。。。
Answer choice D: "ticketed more than once" does not ensure "a more representative sampling." Rather it states that there were repeated offenders on the highway.
Assumption question is different from strengthening question in that the former needs a statement which is necessary for the conclusion to be drawn while the latter simply shed more favorable light on the conclusion.作者: lysdelyon 时间: 2011-7-14 06:22
When you negate A, you get "Drivers who equip their vehicles with radar detectors are more likely to be ticketed for exceeding the speed limit than are drivers who do not."
And this statement is consistent with one of the premise of the argument, therefore the argument still holds. IF you follow the logic chain of the author and adding the negated choice A), the argument is valid because that's what the author claims!
Whether or not the author's conclusion is right or wrong is not our concern for the assumption-type question. We have to treat the author's statements as correct. Since when you negate A, you do not weaken or refute the author's argument, the argument still holds. Therefore, A) is not the necessary assumption.
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