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    精英家教网 > 高中英语 > 题目详情

    【题目】A red light is often used as a danger ________.

    A. signB. signal

    C. signatureD. symbol

    【答案】B

    【解析】

    考查名词词义辨析。句意：红灯常被用作危险的信号。A. sign符号；B. signal信号；C. signature签名；D. symbol象征。根据句意和常识可知，红灯是一种信号，故选B。

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