I felt _____ my heart would burst with joy when I heard the news that Chang'e I was sent up suc

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• 对石门红叶因何而红最确切的解释是A．叶片中的花青素遇酸性物质变红的结果B．叶片中的花青素遇碱性物质变红的结果C．叶片中的叶绿素遇酸性物质变红的结果D．叶片中的花青素原本是-八年级生物
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