National standards for paved roads were in place by 1921. The greatest benefits brought about hy the interstate system was ____

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问题 National standards for paved roads were in place by 1921.
The greatest benefits brought about hy the interstate system was ______.

选项

答案personal freedom of mobility

解析短文第七、八两段谈到美国州际公路带来的诸多益处，第七段最后一句 Above all,相当于题干的the greatest.

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大学英语四级

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