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

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.

单项选择题

All of the following facts about the telegraph and the Internet are true EXCEPT the fact that ______.

A．both develop from the most advanced science of their time
B．they are operated similarly in technical terms
C．both help to change the way we do business and communicate
D．both facilitate the communication between cultures and ethnic groups