It was reported that bacteria contaminated up to 80% of domestic retail raw chicken in the United States.

【正确答案】 C

【答案解析】解析：据报道，细菌污染了美国国内80％的零售生鸡。划线单词contaminate“污染”。inflame“发炎”，inflict“痛苦”，infect“传染，感染”，infiltrate“浸润”。本题正确答案为C。