National standards for paved roads were in place by 1921. [br] It was in the 195

游客2024-03-06  14

问题 National standards for paved roads were in place by 1921. [br] It was in the 1950s that the American government finally took action to build a national highway system.

选项 A、Y
B、N
C、NG

答案 A

解析 见第四段开头:The interstate highway system was finally launched in 1956....
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