单项选择题

The main difference between the terrorism in 1970' s, 1980' s and 1990' s is______.

A．the support of the state
B．its scope
C．its means of violence
D．its target of attack
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单项选择题
Net-war in the 1990' s targets______.
A．destroying information and communication
B．governments
C．military facilities
D．means of production
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