单项选择题

One solution to major security problem is______，which are frequently installed to fix known security holes.

A．patches
B．compensations
C．complements
D．additions
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单项选择题
In______programming，the user determines the sequence of instructions to be executed,not the programmer.
A．top-down
B．structure
C．data-driven
D．event-driven
单项选择题
______means“Any HTML document on a HTTP Server”.
A．Web Server
B．Web page
C．Web Browser
D．Web site
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