28-17: 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

请问这题的答案是否为E.有哪位热心人可以参谋一下. 谢谢!

28-17: 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.

楼主见黄色部份, 是不是打错了?

E好象不对, 我选A.