更多"A rapid means of long-distance tran"的相关试题:
[填空题]A rapid means of long-distance transportation became a necessity for
the United States as settlement spread farther westward. For a long time
the railroad companies met with troubled mechanical problems. The most (1) ______
serious were the construction of rails able to bear the load, and the
development of the safe, effective stopping system. Once these were solved, (2) ______
and the railroad was established as the best means of land transportation. (3) ______
By 1860 they had built thousands of miles of railroads crossing the eastern
mountain ranges and reaching westward in the Mississippi.
The high point in railroad building came by the construction of the (4) ______
first transcontinental railroad. In 1862 Congress had authorized two (5) ______
railroad companies to build lines from Nebraska westward and from
California eastward to a meeting point so as to complete a transcontinental
system. The Central Pacific Com