题目

A: What do people do at ______?B: They have dragon boat races and eat rice dumplings. 答案：【答案】Dragon Boat Festival【解析】根据图片和回答They have dragon boat races and eat rice dumplings.都可以得知，这是端午节。故答案是What do people do at Dragon Boat Festival? (每小题2分)在一个不透明的布袋中装有2个白球和n个黄球，它们除颜色不同外，其余均相同．若从中随机摸出一个球，它是黄球的概率是，则n=    ．