单选题 Libby lied to investigators about his role in disclosing the identity ofa CIA officer in order to ______ the White House from political embarrassment.
A. aviate B. recover C. berate D. insulate

【正确答案】 D
【答案解析】[解析] aviate“飞行”；recover“重新获得，恢复”；berate“严厉指责，申斥”；insulate “使绝缘，隔离”。