prep 12一道逻辑~

哎唷不小心

The faster a car is traveling, the less time the driver has to avoid a potential accident, and if a car does crash, higher
speeds increase the risk of a fatality. Between 1995 and 2000, 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 highway mile driven by
cars.
Which of the following, if true about the United States between 1995 and 2000, most helps to explain why the
fatality rate decreased in spite of the increase in average highway speeds?
A. The average number of passengers per car on highways increased.
B. There were increases in both the proportion of people who wore seat belts and the proportion of cars that were
equipped with airbags as safety devices.
C. The increase in average highway speeds occurred as legal speed limits were raised on one highway after
another.
D. The average mileage driven on highways per car increased.
E. In most locations on the highways, the density of vehicles on the highway did not decrease, although individual
vehicles, on average, made their trips more quickly.

这道题，我看到D就果断选了，因为car-crash fatalities per highway mile的分母增大了啊，整体不是降低了嘛，为什么不对呢
？谢谢各位NN解答。

zjjcookie

无论车开多开少，那个高架依旧在那，还是那么长