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树叶为什么会变

问题. 黄？. 树叶为什么会变. 七（ 9 ）程旸 15. 理论依据. 科普书籍 《 奇妙的植物 》 书中有这样一段话：“叶子里除了含有叶绿色” ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

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树叶为什么会变

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  1. 问题 黄？ 树叶为什么会变 七（9）程旸15

  2. 理论依据 科普书籍《奇妙的植物》书中有这样一段话：“叶子里除了含有叶绿色”…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….. ……… 秋天叶子变黄就是这个原因

  3. 调查答案 1.调查目的 秋天树叶……… ……………………………………………………………………答案是什么 2.主要调查对象 老师、学生、家长

  4. 实验1 问题….. 方法… 目的……

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