秋天到了,一片片叶子飘落下来,像一只只美丽的小蝴蝶。我不禁想:为什么到了秋天,叶子就变了颜色?回到家,我迫不及待地打开电脑,寻找其中的奥秘。原来,叶子中含有三分之二的叶绿素和三分之一的叶黄素、花青素。在夏季我们几乎看不到叶黄素和花青素,我们只 It was autumn, a leaf falling down like a beautiful little butterfly. I can not help thinking: Why in the autumn, the leaves changed color? Back home, I can not wait to turn on the computer, looking for the mystery. It turned out that the leaves contain two-thirds of chlorophyll and one-third of lutein, anthocyanins. In the summer we can hardly see lutein and anthocyanins, we only