单项选择题

A．it helped him earn extra money
B．his season was over
C．he needed more experience
D．he could improve his skills
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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
单项选择题
A．make computer users aware of hackingB．train hacking expertsC．enlighten people on how to prevent computer attacksD．display the harms of hacking
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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