2. 外语
  3. National standards for paved roads were in place by 1921. Trucks using the interstate highways deliver more than ______.

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

admin2008-12-14  8
问题 National standards for paved roads were in place by 1921.
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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大学英语四级

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