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

A. signB. signal

C. signatureD. symbol

【答案】B

【解析】

考查名詞詞義辨析。句意：紅燈常被用作危險(xiǎn)的信號(hào)。A. sign符號(hào)；B. signal信號(hào)；C. signature簽名；D. symbol象征。根據(jù)句意和常識(shí)可知，紅燈是一種信號(hào)，故選B。

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