A rapid means of long-distance transportation became a necessity for the United States as settlement(新拓居地)spread ever farther we

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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.  
The best title for this passage would be______.

选项 A、Settlements Spread Westward
B、The Importance of Railroads in the American Economy
C、American Railroad History
D、The Coast-to Coast Railroad: A Vital Link

答案D

解析 本题为主旨大意题,提问的是下列哪项可以作为文章的题目。第一段写道:当新拓居地向西进发的时候,一种快速的长途交通工具对美国来说成为必要。以下讲述了早期火车和铁路存在的问题。一旦这些问题解决之后,铁路就成为最好的陆上运输工具。到1860年美国已拥有几千里的铁路。第二段主要讲述第一个跨大陆铁路系统的修建。最后一段讲述这条铁路线对促进美国政治和经济所起的重要作用。综上所述,可知本篇第一段是引言段;第二段是发展段;第三段是结论段。根据第三段里的结论,不难选出本题的正确答案为D)。
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