单选题 The post office is not ______ for damage to a parcel sent by mail unless it is insured.
A. qualified B. liable
C. guilty D. jealous

【正确答案】 B

【答案解析】本题考固定搭配。be liable for“应负责任”，如：be liable for damages“有赔偿损坏的责任”，可见此词最合题意。qualified“有资格的；能胜任的”；guilty“有罪的；内疚的”，如：be guilty of a crime“有罪”；be jealous of“忌妒”。