●A firewall is a (68) system designed to (69) all organization,s network aga-inst threats.(68) A．ope

●A firewall is a (68) system designed to (69) all organization,s network aga-inst threats.

(68) A．operating

B．programming

C．security

D．service

(69) A．prevent

B．protect

C．develop

D．exploit

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