单项选择题

A (73) is a value that never changes, for example: the value of Pi (approximately 3.14).

A．variable
B．string
C．Boolean
D．constant
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单项选择题
One solution to major security problems is (75) , which are frequently installed to fix known security holes.
A．patches
B．compensations
C．complements
D．additions
单项选择题
(74) is a clickable string or graphic that points to another Web page or document.
A．Link
B．Anchor
C．Browser
D．Hyperlink
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