题型：阅读选择 题类： 难易度：普通
浙江省杭州市杭州中学2023-2024学年八年级上学期期中英语试卷
We all enjoy the colors of autumn leaves．Did you ever wonder how and why a leaf changes color？Where do the yellows and oranges come from？To answer those questions，we first have to understand what leaves are and what they do．
Leaves are the world's food factories．Plants take water from the ground through their roots and take CO2 from the air．Plants use sunlight to turn water and CO2 into glucose（葡萄糖），a kind of sugar．Plants use it as food for energy and growing．
A chemical called "chlorophyll（叶绿素）" in the leaves gives plants their green color．As summer ends and autumn comes，the days get shorter and shorter，and trees "know" it's time to begin getting ready for winter．
During winter，there is not enough sunlight or water．Trees rest during this time and live on the food they store during the summer．They begin to shut down their foodmaking factories．As the green chlorophyll disappears from the leaves，we begin to see yellow and orange leaves．
The bright reds and purples we see in leaves are made mostly in autumn．In some trees，like maples（枫树），sunlight and the cool nights of autumn turn the glucose in the leaves into a red color．And we can enjoy the beautiful red leaves during autumn．
sunlight + 
+ CO2 → glucose
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