Viruses usually have two phases to their execution, the infection phase and the(75)phase. The later phase is optional, since sto

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问题 Viruses usually have two phases to their execution, the infection phase and the(75)phase. The later phase is optional, since stone viruses simply reproduce.

选项 A、reproduce
B、proliferation
C、defend
D、attack

答案D

解析 译文:病毒在执行的过程中通常有两个阶段:感染阶段和攻击阶段。有些病毒只进行简单的复制,因此可能没有攻击阶段。
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