______in order to save oil, the national speed limit decreased from 60 mph to 55 in the 1970s? ______inhabited areas should hav

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问题 ______in order to save oil, the national speed limit decreased from 60 mph to 55 in the 1970s?
______inhabited areas should have the speed limit reduced to 20 mph, and be controlled well?

选项 A、 
B、 
C、 
D、 

答案D

解析 住在乡村的Tim Richards认为人多的地区车速应减少到20 mph。故此题应选D。
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