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【简答题】
萝卜中具有较多的胡萝卜素，它是人体的主要营养之一。α-胡萝卜素的结构为： (1)写出α-胡萝卜素的分子式________。 (2)1 mol胡萝卜素最多能与________ mol Br 2 反应。 (3)β-胡萝卜素与α-胡萝卜素互为同分异构体，且只是虚线框内部分不同，但碳的骨架相同，写出β-胡萝卜素方框内可能的结构：______________________。
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