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

解析名词词义辨析。根据句意：闪烁的红灯只能用来“警示”危险，其它不符合逻辑。选项中，caution意为“谨慎，警告”，符合句意。故答案为B。

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