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单选题
As we all know, a red traffic light is often a danger ______ .
A
mark
B
sign
C
symbol
D
signal
参考答案
参考解析
解析：
句意：我们都知道，红色的交通灯是危险的信号。signal（以手势、声音、行动等发出的）信号，暗号。mark（用符号等做的）标记，记号。sign动作，手势；（有特殊含义的mark）标记。 symbol象征；（在计算或者物理方面的）符号。句中表示“交通灯发出的信号”，用signal。故答案是D项。
句意：我们都知道，红色的交通灯是危险的信号。signal（以手势、声音、行动等发出的）信号，暗号。mark（用符号等做的）标记，记号。sign动作，手势；（有特殊含义的mark）标记。 symbol象征；（在计算或者物理方面的）符号。句中表示“交通灯发出的信号”，用signal。故答案是D项。
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