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AIDs is a disease that _______ the body”s  immune system.
A breaks out   B. breaks into   C. breaks down   D. breaks up
C
词义辨析。breaks out战争,火灾的爆发;breaks into闯入;breaks down损坏;breaks up结束,使破碎。句意:爱滋病是一种破坏人体免疫系统的疾病。所以选C。
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