Question

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

A. signB. signal

C. signatureD. symbol

Answer 1

【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。