英语四级阅读单选题讲解
来源:才华咖 本文已影响9.34K人
来源:才华咖 本文已影响9.34K人
A rapid means of long-distance transportation became a necessity for the United States as settlement spread over 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 loadand the development of a safe,effective stopping system. Once these were solved?the railroad was established as the best means of land transportation. By I860 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 major problems with Americans 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
讲解答案:
本题问的是19世纪中叶美国铁路系统存在的问题。作者在第一段第三句中指出,当时最严重的'技术问题是the construction of rails able to bear the road和the development of a safe,effective stopping system,所以答案为A。这个问题与该句的比较考点相联系The most serious ones。
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