单项选择题

Mental decay due to aging is ______.

A．common
B．much more common than most people believe
C．much less common than most people believe
D．true of those over sixty
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单项选择题
Before the Bell Company became a publicly held corporation, how were the calls passed to their destination
A．Manual switchboards.
B．Reading manuals.
C．Electronic switchboards.
D．Voice switches.
单项选择题
What cause the prices of the telephone system to lower in America
A．The materials became cheaper.
B．There was more competition.
C．More people used the phones.
D．The phones were connected across the se
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