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A．more than a year.
B．half of the year.
C．only one year.
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A．is provided by the nation.
B．belongs to one's own.
C．is shared by all.
A．the processing capacity of the computer system.
B．theproduction of the computer.
C．the performance of the Internet.
A．some innovation.
B．the human society or social relations.
C．the awareness of changing the system.
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