新prep2-119

liuqiangde

119.
                (32105-!-item-!-188;#058&006854)     (GWD 28-Q17)

 

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.

答案是A，这道题每看懂，请指教，谢谢。

taixiKim

co ask!!

xfi883

原文大意：

在P国，大型卡车上路的里程虽少，但却造成了双倍的高速车祸。

然而，超大型卡车只是其他卡车造成的车祸数量的三分之一。

因此，那些承运商最好使用超大型卡车。

削弱前提即可。

A选项意思是：迄今为止，那些超大型卡车只是在“非拥挤的”高速路端行驶。

这就等于说，前提的统计依据并不全面，没有涵盖“拥挤”路段的车祸数量。因此，严重地削弱了前提。

这和那道“A飞机公司比B飞机公司不安全”的题目异曲同工。直接用其他原因否定前提——“不安全不是因为飞机公司，而是因为飞机场”。

[此贴子已经被作者于2009-6-29 7:26:12编辑过]