GWD-28-Q17，请问B在说什么

chenliqiang

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

A答案没有关系，但是不知道B在说什么，请指教了。

dustyrick

不管Partoria制定怎样的条例， 他们总是会对一些小路不设限。

oldhorse858

off-limits是禁止进入的意思，说的是无论P出台什么样的条例，它还是会对卡车在一些小型道路的通行上设限

imjiaying

这个题不太懂~

fiona_hq

up

OTSUKAAINAI

话说，这题的答案是啥？

W.H.Y

答案是A. 也是Prep上的题.
题目罗列数据想表明卡车事故率需要重视, 其中三挂卡车事故率低, 所以提出方案, 认为应当要求承运方用三挂卡车.
A答案说三挂卡车只在(1)高速干道的(2)交通通畅段开. 这给三挂卡车的应用范围增加了两个特殊条件. 这样要求承运方用三挂卡车的要求就不是普适要求, 因此不可操作, 削弱了提议方案. 正确.
B答案讲所有大卡都不能上小路. 首先题目比较的是不同类型的大卡, "小路禁止所有大卡通行"这一点不能在不同类型的卡车之间形成区分. 另外大卡已经纳入统计了, 业已禁止大卡通行的路不在考察范围之内. 另外就算有关小路的规章能削弱方案, 也提出了新的问题, 即小路规章和处理大卡的事故率有什么关系. 排除.