According to the passage, all of the following were true of railroads in the United States

* Hướng dẫn giải

Đáp án là D

A và C được đề cập: The railway network expanded rapidly until the railroad map of the United States looked like a spider’s web, with the Steel filaments connecting all important sources of raw materials, their places of manufacture, and their centers of distribution.

B được đề cập: The railroads contributed to the industrial growth not only by connecting these major centers, but also by themselves consuming enormous amounts of fuel, iron, and coal.