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四、阅读理解（本大题共10小题，每小题2分，共20分）
本部分有两篇短文，每篇短文后有五个问题,每个问题有四个选项,选择最佳答案完成句子。错选、多选或未选均无分。
Passage 1
A rapid means of long-distance transportation became a necessity for the United States as settlement 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 rails crossing the eastern mountains 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 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 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 labourers. The two groups worked at great 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.
56. The major problems with America’s railroad system in the mid-19th century lay in ______.
A. poor quality rails and unreliable stopping systems
B. lack of financial support for development
C. limited railroad lines
D. lack of a transcontinental railroad
57. The building of the first transcontinental system ______.
A. brought about a rapid growth of industry and farming in the west
B. attracted many visitors to the construction sites
C. attracted laborers from Europe
D. encouraged people to travel all over the country
58. The construction of the transcontinental railroad took ______.
A. 9 years B. 4 years
C. 7 years D. 3 years
59. What most likely made people think about a transcontinental railroad?
A. The possibility of government support for such a task.
B. The need to explore Utah.
C. The need to connect the east coast with the west.
D. The need to develop the railroad industry in the west.
60. The best title for this passage would be ______.
A. Settlements Spread Westward
B. The Coast-to-Coast Railroad: A Vital Link
C. American Railroad History
D. The Importance of Railroads in the American Economy
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