单项选择题

Most （） measures involve data encryption and password.

A．security
B．hardware
C．display
D．program

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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

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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