昊昊很早就参加了北京自然博物馆小小讲解员班的学习，暑假里参加了很多活动，开学后时间紧去的次数少了。很巧的是小学同班同学朱怡佳也是一个小小志愿者，两个孩子都很久没去服务了，这不寒假刚开始就约好了一起去自然博物馆为大家服务。
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