题目内容
（请给出正确答案）
（）is the first line of protect between your computer and the public Internet.
A.The Internet protocolB.The firewallC.The anti-virus software D.The intrusion-detection systems
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
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A、enjoyment
B、banquet
C、festival
D、achievement
E、possessions
A、renounced
B、pronounced
C、denounced
D、announced
A、If a particular thing accounts for a portion of something, that proportion consists of that thing.
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