单项选择题

（）software, also called end-user program, includes database programs, word processors, spreadsheets etc.

A．Application
B．System
C．Compiler
D．Utility

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单项选择题
A（）consists of the symbols, characters, and usage rules that permit people to communicate with computer.

A．programming language
B．network
C．keyboard
D．display
单项选择题
A（）is a functional unit that interprets and carries out instructions．

A．memory
B．processor
C．storage
D．network
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