______in order to save oil, the national speed limit decreased from 60 mph to 55 in the 1970s? ______the oil consumption has in

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问题 ______in order to save oil, the national speed limit decreased from 60 mph to 55 in the 1970s?
______the oil consumption has increased alarmingly, there were only forty years of oil supply?

选项 A、 
B、 
C、 
D、 

答案B

解析 Mike Bent在文章中说:"fuel consumption increases alarmingly above about 90 mph,so with only 40 years of petrol supplies remaining".可以看出他认为只有40年的石油供应了。
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