单项选择题

The largest system serving e-mail messengers is the Internet, a ______ of millions of computers linked worldwide.

A．unity
B．combination
C．network
D．connection
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单项选择题
There is not a conductor ______ resists the flow of the electrical charges.
A．which
B．but
C．that
D．it
单项选择题
______ stereophonic phonograph records, two recordings are made of the same musical performance.
A．Creates
B．Created
C．The creating of
D．To create
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