The flashing red light served as a ______ of danger ahead.

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问题 The flashing red light served as a ______ of danger ahead.

选项 A、predictor
B、caution
C、precaution
D、prevention

答案B

解析 caution谨慎，警告；precaution预防措施或方法；predictor预测器，预报仪器；prevention预防，阻止，妨碍。

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