______in order to save oil, the national speed limit decreased from 60 mph to 55 in the 1970s? ______that both cars and roads w

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问题 ______in order to save oil, the national speed limit decreased from 60 mph to 55 in the 1970s?
______that both cars and roads were engineered to be safe to operate at much higher speeds?

选项 A、 
B、 
C、 
D、 

答案A

解析 从A中我们看到Bernhard Hoff说:"Only problem was that both cars and roads were engineering to be safe to operate at much higher speeds"。
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