1.下列事件是随机事件的是( )
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| A. | 在标准大气压下,温度低于0℃时冰融化 | |
| B. | 小明骑车经过某个十字路口时遇到红灯 | |
| C. | 地球上海洋面积大于陆地面积 | |
| D. | 如果a、b都是实数,那么a+b=b+a |