A rapid means of long-distance transportation became a necessity for the Uni

游客2025-03-18 10

问题 A rapid means of long-distance transportation became a necessity for the United States as settlement (新拓居地) spread ever farther westward. The early trains were impractical curiosities, and for a long time the railroad companies met with troublesome mechanical problems. The most serious ones were the construction of rails able to bear the load, and the development of a safe, effective stopping system. Once these were solved, the railroad was established as the best means of land transportation. By 1860 there were thousands of miles of railroads crossing the eastern mountain ranges and reaching westward to the Mississippi. There were also regional southern and western lines.
The high point in railroad building came with the construction of the first transcontinental system. In 1862 Congress authorized two western railroad companies to build lines from Nebraska westward and from California eastward to a meeting point, so as to complete a transcontinental crossing linking the Atlantic seaboard with the Pacific. The Government helped the railroads generously with money and land. Actual work on this project began four years later. The Central Pacific Company, starting from California, used Chinese labor, while the Union Pacific employed crews of Irish laborers. The two groups worked at remarkable speed, each trying to cover a greater distance than the other. In 1869 they met at a place called Promontory in what is now the state of Utah. Many visitors came there for the great occasion. There were joyous celebrations all over the country, with parades and the ringing of church bells to honor the great achievement.
The railroad was very important in encouraging westward movement. It also helped build up industry and farming by moving raw materials and by distributing products rapidly to distant markets. In linking towns and people to one another it helped unify the United States. [br] The construction of the transcontinental railroad took______.

选项 A、9 years
B、4 years
C、7 years
D、3 years

答案 D

解析本题是一道具体细节题。问建成美国的横贯大陆的铁路系统用了多长时间。根据文章的第二段第二句，美国国会是1862年授权给两家铁路公司建造横跨美国大陆的铁路的，但实际修建工作是4年后才开始的，见第二段第四句。1869年两路人马在犹他州的普罗蒙特利市相会，见第二段第七句。因此，本题的正确的答案应该是D：1869—1862一4=3年。

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