单项选择题

(72) is a sequence of letters and digits, the first character must be a letter.

A．An identifier
B．A string
C．An array
D．program
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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
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
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