National standards for paved roads were in place by 1921. [br] Trucks using the

游客2024-03-06 44

问题 National standards for paved roads were in place by 1921. [br] Trucks using the interstate highways deliver more than ______.

选项

答案 75 percent of the nation’s freight

解析见第八段第一句。

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[originaltext]IndependenceDayisthenationalholidayoftheUnitedStates