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题库 / Prep2012-CR-12
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?
The average number of passengers per car on highways increased.
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.
The increase in average highway speeds occurred as legal speed limits were raised on one highway after another.
The average mileage driven on highways per car increased.
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.
background：车子行驶速度越快，死亡率越高。
1995-2000之间高速公路的平均速度显著增加了，但是高速每公里的死亡人数下降了。问explain, 即找一个新的evidence抵消因为速度增加带来的死亡率增加
choice b, 佩戴安全带的乘客，和配置了安全气囊的汽车比例增加了。correct
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