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
C++ fully supports ______ programming.
A．visual
B．object-oriented
C．logic
D．natural language
单项选择题
A ______ system placed between the company network and the outside world may limit outside access to the internal network.
A．firewall
B．modem
C．gateway
D．key
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