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 trained people to operate them.
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单项选择题
Why does the author mention the Sierra Nevada in line 10
A．To argue that a mom direst route to the West could have boon taken,
B．To identify a historically significant mountain range in the Went,
C．To point out the legation of n serious train accident,
D．To give an example of an obstacle faced by the central pacific.
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 modes of transportation to reach western destinations
C．passengers preferred stagecoaches
D．railroad travel was quite expensive
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