单项选择题

A．make computer users aware of hacking
B．train hacking experts
C．enlighten people on how to prevent computer attacks
D．display the harms of hacking
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单项选择题
A．oneB．twoC．fourD．six
A．one
B．two
C．four
D．six
单项选择题
A．general pessimism aboutB．some doubt aboutC．different interpretations ofD．much optimism about
A．general pessimism about
B．some doubt about
C．different interpretations of
D．much optimism about
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