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【单选题】
根据《中华人民共和国网络安全法》的相关规定，关键信息基础设施的运营者应当履行以下哪些安全保护义务?A.
定期对从业人员进行网络安全教育、技术培训和技能考核
B.
对重要系统和数据库进行容灾备份
C.
制定网络安全事件应急预案，并定期进行演练
D.
以上都是
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A.
reads
B.
read
C.
which reading
D.
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【单选题】There's only yogurt in the glass. Could you let me have more? [ ]
A.
a little; any
B.
a little; some
C.
little; some
D.
little; any
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A.
firm offering you
B.
offering you firm
C.
to be offered to you firm
D.
to firm offer you
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