单项选择题

A(n)______ allows users to scramble and unscramble their messages easily without a third partyintruding．

A．DES
B．signing messages
C．encrypt
D．firebreak
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单项选择题
In(75)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
Resolution typically is(71)2 in dots per inch(dpi), and is stated as the number of columns and rows of dots.
A．computed
B．stack
C．measured
D．searched
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