单项选择题

What is the passage mainly about

A．Driving to work.
B．Business management policies.
C．Computers of child-care purposes.
D．Extending the workplace by means of computers.
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单项选择题
The word subversive in Para. 2 most probably means _________ .
A．destructive
B．tolerable
C．constructive
D．submissive
单项选择题
The main difference between Gnutella and Napster is that_________.
A．nobody can block Napster's searching
B．their searches are conducted differently
C．it is much more difficult to give away Napster
D．Gnutella needs a central server computer to search
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