单项选择题

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

A．Application software
B．Utility software
C．System software
D．Compiler software
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单项选择题
An ______ statement can perform a calculation and store the result in a variable so that it can be used later.
A．assignment
B．executable
C．input
D．output
单项选择题
Logistics seeks to identify the cheapest way of achieving a given level of ______ or service to customers.
A．avoiding
B．independent
C．related
D．availability
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