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
（）is a clickable string or graphic that points to another Web page or document.

A．Link
B．Anchor
C．Browser
D．Hyperlink
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
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