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题库 / OG2017V-CR-133
Which of the following most logically completes the argument?
When officials in Tannersburg released their plan to widen the city's main roads, environmentalists protested that widened roads would attract more traffic and lead to increased air pollution. In response, city officials pointed out that today's pollution-control devices are at their most effective in vehicles traveling at higher speeds and that widening roads would increase the average speed of traffic. However, this effect can hardly be expected to offset the effect pointed out by environmentalists, since __________.
increases in traffic volume generally produce decreases in the average speed of traffic unless roads are widened
several of the roads that are slated for widening will have to be closed temporarily while construction is underway
most of the air pollution generated by urban traffic comes from vehicles that do not have functioning pollution-control devices
the newly widened roads will not have increased traffic volume if the roads that must be used to reach them are inadequate
a vehicle traveling on a route that goes through Tannersburg will spend less time on Tannersburg's roads once the roads are widened
结论是官员认为的影响（即车速快了，污染设备高效所以排放的污染少了）不足以抵消环境学家认为的影响（车多了 污染多了）
A 除非路宽了，否则车多导致车速下降。 这讨论没拓宽路的情况。无关
B 因为施工一些路需要暂时关闭，情况只是暂时的
C 大部分污染是由没有污染控制设备的车引起的。说明虽然车速快了，但是那些没装设备的车还是污染多多，况且车还越来越多。
D 如果路不通，那么这些新拓宽的路没有车辆增长。和推理文段没什么关系
E 路宽了，开车时间少了，说明车速快了。没法削弱
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