题目内容：
下列标志牌中，表示注意安全的是（ ）。 
参考答案：
答案解析：
单选题：下列标志牌中，表示注意安全的是（ ）。
- 题目分类：小学综合素质
- 题目类型：单选题
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第47题应选：
第47题应选：A．free B．quick C．clever