单项选择题

Small business may use（）for word processing.

A.microcomputers
B.industrial computers
C.mainframe computers
D.supercomputers

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单项选择题
（）system let you run more than one program at a time.

A.Application
B.Software
C.Real time
D.Multitask
单项选择题
The（）is the primary device for entering information into The computer.

A.disk
B.printer
C.keyboard
D.memory
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