单项选择题

Up to now, the author's word processor and email program are not attacked because _________.

A．they are worth nothing
B．the hackers have no interest in them
C．the hackers don't have enough time
D．the hackers are chased by the police
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单项选择题
The awarding of lands as _________ to the nobleman led to the weakening of the central government.
A．domains
B．donations
C．notations
D．congratulations
单项选择题
Which of the following statements is TRUE about viruses
A．All viruses are dangerous even if used properly.
B．All viruses are not so dangerous if used properly.
C．Viruses appeared later than personal computers.
D．Some viruses have been of some value to science.
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