单项选择题

According to Dr. Jarvik's studies, middle-aged and older persons would expect to ______.

A．remember less
B．reason better
C．learn fewer things
D．lose no intellectual ability
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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
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.
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