科学素养与生活应用·英语30篇（2）

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秋叶变色为何源于色素分解？

Chlorophyll gives leaves their green color and breaks down as daylight shortens in fall.
With less sunlight, trees stop producing chlorophyll and reabsorb its nutrients before leaf drop.
Carotenoids, always present but masked by green pigment, become visible as yellows and oranges.
Anthocyanins form only in autumn from excess sugars trapped in leaves under cool, sunny days.
Soil acidity and tree species influence whether reds, purples, or browns dominate the display.
Maple trees produce vivid reds due to high sugar concentration and efficient anthocyanin synthesis.
Drought or early frost can dull colors by stressing trees and halting pigment production.
Deciduous trees shed leaves to conserve water during winter when roots absorb less from frozen soil.
Leaf litter later decomposes, returning nutrients to forest soil for next year’s growth.
Scientists study pigment chemistry to understand plant responses to climate change patterns.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Scientists study pigment chemistry to understand plant responses to climate change patterns. 科学家通过研究色素化学，探究植物对气候变化的响应规律。
Leaf litter later decomposes, returning nutrients to forest soil for next year’s growth. 落叶腐烂后回归森林土壤，为来年生长提供养分。
Chlorophyll gives leaves their green color and breaks down as daylight shortens in fall. 叶绿素赋予叶子绿色，秋季日照缩短时会分解。

这篇中文题目最接近哪一句？秋叶变色为何源于色素分解？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？叶绿素赋予叶子绿色，秋季日照缩短时会分解。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Leaves Change Color in Autumn Due to Pigment Breakdown How to cook noodles A maths worksheet

Scientists study pigment chemistry to understand plant responses to climate change patterns.

Scientists study pigment chemistry to understand plant responses to climate change patterns.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Scientists study pigment chemistry to understand plant responses to climate change patterns.