单项选择题

The computer sends signal in the form of ______.

A．electrical impulses
B．machines
C．instructions
D．automatic impulses
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单项选择题
Each of those machines in the past can only perform ______.
A．many operations
B．two operations
C．a single operation
D．none of operations
单项选择题
What does the man need to do to see the page numbers
A．To print the document.
B．To use a new printer.
C．To reset the computer.
D．To press some buttons.
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