In Internet,(66)used as a barrier to prevent the spread of viruses.

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问题 In Internet,(66)used as a barrier to prevent the spread of viruses.

选项 A、modom
B、firewire
C、firewall
D、netcard

答案C

解析 译文:网上使用防火墙作为阻止病毒传播的屏障。
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