单项选择题

As they access the corporate network, mobile and remote users inadvertently can infect the network with ______ and worms acquired from unprotected public networks.

A．sickness
B．disease
C．germs
D．viruses
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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
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
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