They improved communications despite tough circumstances, laid down important （） for the frontier’s development, and also made vital contributions to preserving the Union.
A.appreciation
B.infrastructure
C.link
D.innovative
正确答案：infrastructure
They improved communications despite tough circumstances, laid down important （） for the frontier’s development, and also made v
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The post fostered unique American culture of （） ideas and uncensored opinions.
Transportation industry was also （） by government to carry the mail.
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