单项选择题

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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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

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.