求教prep12里一个CR题目

jiangqinyao

求教prep里面一个逻辑题目

The faster a car istraveling, the less time the driver has to avoid a potential accident, and if acar does crash, higher speeds increase the risk of a fatality. Between 1995 and2000, average highway speeds increased significantly in the United States, yet,over that time, there was a drop in the number of car-crash fatalities per highwaymile driven by cars.

Which of the following, iftrue about the United States between 1995 and 2000, most helps to explain why the fatality ratedecreased in spite of the increase in average highway speeds?

D. The average [url=]mileage[/url] driven on highways per car increased.

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小弟不明白为什么这个D选项不对。个人的逻辑是也许死亡的人数是增加了，但是行驶里程增加的更快导致每公里的死亡人数没有上升。

还请高人指教。