单项选择题

______software，also called end-user program，includes database programs，word processors spreadsheets etc.

A．Application
B．System
C．Compiler
D．Utility
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单项选择题
Insufficient______can cause a processor to work at 50% or even more below its performance potential.
A.mouse
B．I/O
C．document
D．memory
单项选择题
In C language，the result of the logical______operator is 1 if the value of its operand is 0，0 if the value of its operand is non—zero.
A．AND
B．NOT
C．0R
D．EOR
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