单项选择题

In（）, the only element that can be deleted or removed is the one that was inserted most recently.

A．a line
B．a queue
C．an array
D．a stack

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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
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
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