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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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.

单项选择题

The construction of the transcontinental railroad took（）

A．9 years
B．7 years
C．4 years
D．3 years