National standards for paved roads were in place by 1921. Service stations, motels and restaurants promoted the development of

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问题 National standards for paved roads were in place by 1921.
Service stations, motels and restaurants promoted the development of the interstate highway system.

选项 A、Y
B、N
C、NG

答案B

解析 第八段提到…it (the highway system) has led to the growth of spin-off industries like service stations, motels, restaurants, and shopping centers. 恰好和本题的因果关系相反。
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