单项选择题

What can be inferred about coaches and wagon freighters as the railroad expanded

A．They developed competing routes.
B．Their drivers refused to work for the railroads.
C．They began to specialize in private investment.
D．There were insufficient numbers of people to take them.
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单项选择题
The author refers to the impact of railroads before the late 1860's as limited because ______.
A．the track did not take the direct route from one city to the next
B．passengers and freight had to transfer to other means of transportation to reach western destinations
C．passengers preferred stagecoaches
D．railroad travel was quite expensive
单项选择题
Why does the author mention the Sierra Nevada in line 12
A．To argue that a more direct route to the West could have been taken.
B．To identify a historically significant mountain range in the West.
C．To point out the location of a serious train accident.
D．To give an example of an obstacle faced by the central pacific.
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