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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单项选择题
To protect your computer, it is wise of you _________.
A．to seldom check whether your computer is infected with viruses
B．not to open a file sent by a stranger
C．to never pass a new file through anti-virus software
D．to upgrade your program as soon as a new version comes out
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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