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填空题
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参考解析

解析:
self-preservation。考点:名词。分析句子结构,空格前面的and连接并列结构,and前为名词defense,故空格处也应填入名词。passive defense意为“消极防御”,消极防御也就是只进行防守,即自我保护,观察所给选项,只有D项名词self-preservation“自我保护”符合句意。

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