单项选择题

What caused the prices of the telephone system to lower

A．The materials became cheaper.
B．There was more competition.
C．More people used the phones.
D．The phones were connected across the sea.
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单项选择题
Where was the first telephone service in America established
A．New York.
B．Washington.
C．Philadelphia.
D．Chicago.
单项选择题
Before the Bell Company became a publicly held corporation, how were the calls passed to their destinations
A．Manual switchboards.
B．Reading manuals.
C．Electronic switchboards.
D．Voice switches.
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