单项选择题

（）is not a linear structure

A．Graph
B．Queue
C．Stack　
D．1-dimension array

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单项选择题

（） is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC.

A．Interface　
B．Operating system
C．Internet
D．Application software

单项选择题

A （）copies a photograph, drawing or page of text into the computer.

A．scanner
B．printer　
C．display
D．keyboard

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