该产品的说明书如图1：

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得知：过氧碳酸钠（Na₂CO₄） 俗称“固体双氧水”，白色结晶颗粒．

“污渍爆炸盐”溶于水后，Na₂CO₄与H₂O反应只生成2种物质，1种是碳酸盐，另1种化合物A．

设计知识简图也是学习历史的好方法。下图反映的是世界史上的一些重要会议。决定成立联合国的会议是（  ）

    Hello, I'm Lily. I have a friend. Her name's Sally. She's eleven. Her birthday is on 10th July. She lives far from school. She goes to school by bus. Her favourite colour is red. She has a red hat. She can read and write. She is good at writing. She wants to be a teacher in the future. She wants to teach Chinese in a school.

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