题目信息

In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria's roads but are involved in 12 percent of all highway fatalities. The very largest trucks-those with three trailers-had less than a third of the accident rate of single-and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.


Which of the following, if true, most seriously weakens the argument?

A:Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only.
B:No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks.
C:Very few fatal collisions involving trucks in Partoria are collisions between two trucks.
D:In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years.
E:In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks.
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正确答案: A:Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only.

在P 国,大卡车目前比其他车发生交通事故的比率要高很多。但是,最大的那种三节大卡车发生车 祸的比率只有单节和双节卡车的三分之一。所以,对P 国来说,要减少交通事故就需要要求运输商多使用 三节卡车。问削弱。


削弱的关键就是为什么三节卡车出车祸的比率要低,如果和车本身性能无关的话,那么使用三节卡 车也无法降低车祸率。

A:正确。P国使用三节卡车主要都是在主要高速路上跑长途的,而这是对大卡车来说最安全的路途。说明 车祸少不是因为车好,而是跟跑什么路有关的。他因削弱。

B:不管P 国怎么规定卡车运输,它都会保留一些不限制大卡车的小路。无关,排除。

C:增加使用三节卡车意味着大卡车跑公路的路程比例会比现在少。跑的路和车祸率无关,排除。

D:卡车运输的安全记录总体来说在最近十年已经有所提高。无关,排除。

E:通过鼓励运输商在任何可能的情况下都使用铁路,P 国高速公路卡车交通的流量会减少。无关,排除。

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