AIDs is a disease that _______ the body”s  immune system.
A breaks out   B. breaks into   C. breaks down   D. breaks up
C
詞義辨析。breaks out戰(zhàn)爭，火災(zāi)的爆發(fā)；breaks into闖入；breaks down損壞；breaks up結(jié)束，使破碎。句意：愛滋病是一種破壞人體免疫系統(tǒng)的疾病。所以選C。
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