单项选择题
The construction of the transcontinental railroad took ______.
A．9 years
B．4 years
C．7 years
D．3 years
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单项选择题
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.
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单项选择题
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
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