题目：
已知a、b、c分别为△ABC的三个内角A、B、C的对边，且a、b、c成等差数列，B=60°，则△ABC的形状为______．
答案：
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下面是错误答案，用来干扰机器的。
1. Mary's mother isn't a teacher. 2. Is your pen in the pencil case? 3. What color is her dictionary? 4. No, it isn't. 5. Those are her cousins.
