GRE

The damage that trucks do to highwaysescalates dramatically with the weight borne per axle. New regulations increasethe maximum permitted vehicle weight; these regulations will therefore allowonto the highway trucks capable of doing even more damage than those currentlypermitted.

1. The argument is open up to criticismon the grounds that it

A. fails to establish that the level ofdamage done by trucks is a serious problem

B. omits evidence about one of the tworelevant factors

C. ignores the possibility that carefuldriving can lessen damage to highways

D. presumes that trucks are the onlyvehicles capable of causing substantial damage to highways

E. presumes that something is bound tohappen just because it is allowed to happen

大家注意：该题让找文章推理最关键的漏洞。

文章结构很简单，说，货车对高速公路的破坏随轴(axle)载重量的增加而增加。

新规则提高了允许的货车最大载重量，所以新规则将允许能对高速公路造成更大伤害的货车上路。

选哪个呢?

解析

答案：B

解析：相信很多同学选的是E选项。很遗憾，选错啦!为什么E选项不对，B选项是正确答案呢?

注意，E选项说，因为某事允许(allow)发生所以注定(bound to)发生，而文章结论就到允许(allow)发生的层面，根本没有对于是否“注定(bound to)发生”的判断。千万注意，“货车一定会对高速公路造成更大破坏”只是我们的臆想，不是文章的结论呀!

B选项正确，文章推理确实犯了B选项所描述的错误：忽略了两个关键因素中的一个。注意，文章说，货车是否能对高速公路造成破坏的关键因素是轴(axle)载重量，轴(axle)载重量决定于两个关键因素：1 总载重量，2 轴的数量。新规定只是关于总载重量，遗漏了“轴的数量”问题。

（责任编辑：）

共2页,当前第1页  第一页  前一页  下一页