The successful spread of a virus depends on how long it can(74)unnoticed, before its presence is made known by the activation of

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问题 The successful spread of a virus depends on how long it can(74)unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses(75)their code to avoid recognition.

选项 A、interpret
B、open
C、decrypt
D、encrypt

答案D

解析 译文:例如,许多病毒通过加密自身代码的方式避免被发现和检测。
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