The（）is a collection of computers connected together by phone lines that allows for the global sharing information.

单项选择题（） is the sending and receiving of the message by computer. It is a fast, low-cost way of communicating worldwide.

A．LAN　
B．Post office
C．E-Mail
D．Interface

单项选择题（）is not a linear structure

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

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

单项选择题The（）controls the cursor or pointer on the screen and allows the user to access commands by pointing and clicking.

A．graphics
B．printer
C．program
D．mouse