第18题: [单项选择]What a great weight mother felt______ her mind the moment she found her lost son. A. turned off B. taken off C. set off D. broken off 参考答案:B 答案解析:[解题指要] 该题测试动词短语take off的用法。feel a great weight taken off one's mind,意思是“如释重负”。A选项turned off意思是“关掉”,C