Put the pedal to the metal, if you’re driving in Montana. That state is about to abandon the little loved 65mpb speed limit and,

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问题     Put the pedal to the metal, if you’re driving in Montana. That state is about to abandon the little loved 65mpb speed limit and, indeed, any limit at all. The state’s regulators have been wanting to do this for years, but until now were prevented by a federal law passed 22 years ago.
    The end came on November 28th, when a new federal highway bill was signed into law by President Clinton. The president admitted misgivings, perhaps because his own father had been killed in a road accident, but it was clear that a veto would have been most unpopular. The old speed limit was "about the most disregarded law in America", notes Csaba Csere. editor of Car Driver magazine, A recent study, he said, found that the average speed on interstate highways in Michigan was 74mph. Until this week, the official limit was 55mph on urban freeways and 65mph on rural expressways.
    Out west, where a motorist may travel 100 miles without seeing another car, nine states will immediately jump to at least 70mph, and Nevada, Wyoming and Kansas will go to 75mph; in Montana it is any speed you like in the daytime (though lorries must still keep to 65). Farther east, where traffic is denser and the weather less reliable, some states are likely to keep to 55 to 65mph.
    The national speed limit was passed in 1973 when the first oil crisis had almost trebled fuel prices. In 1974, congress ordered a 50mph limit, raised to 55 when the oil crisis had passed. But by then safety enthusiasts were arguing that lower speed limits would sharply reduce road deaths, and they continued to arger their case even as Mr Cliton signed the bill this week. The change is "equivalent to a death sentence to thousands of Americans", says Joan Claybrook, a former head of the National Highway Traffic Safety Administration.
According last paragraph, the old national speed limit related to ______.

选项

答案Oil crisis

解析 本题问的是旧的国家时速限制与什么有关。本题只要看懂了最后一段的前两句话,问题就有了结论。前两句的意思是:国家时速法案1973年通过,当时第一次石油危机使燃料价格增长了两倍。到了1974年,国会明令为50英里/小时,石油危机过后提高到55英里/小时。通过这两句话我们得知,1973年法规的制定与74年的修改,都与oil crisis有关,因此,答案理应为 oil crisis.
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