8A 作文素材库 · U7《The natural world》自然世界（2024 版新教材）
教材单元：Module 2 · U7 The natural world（自然世界）
Reading 话题：The earth's main ecosystems
核心语法：双宾语 SVIOODO / SVDOOC
本素材库状态：⏳ 骨架
目标：把"生态系统 / 环境保护"话题写得宏观且有深度
话题词汇速查
| 类别 | 词汇 |
|---|---|
| 生态系统 | forest, ocean, desert, grassland, wetland |
| 环境 | environment, pollution, balance, ecosystem |
| 行动 | recycle, save, plant trees, reduce, reuse |
| 形容词 | natural, beautiful, polluted, harmful |
A 档写作必会句型（待笔记到位后填实）
- 双宾语 give / show / teach / tell sb sth
- 例：The earth gives us food and water.
- We should do sth (to do)
- 例：We should try our best to keep the environment clean.
- If we ..., ... will ...
- 例：If we cut down too many trees, animals will lose their homes.
- ... is harmful to ...
- 例：Pollution is harmful to our health.
- keep + n + adj
- 例：We should keep the water clean.
📅 累积区（学 U7 时填）
孩子开始学 U7 后，每天新增 2-3 句会归档到这里。
计划累积
| 周次 | 计划句数 | 主题 |
|---|---|---|
| W49-W50 | 18 句 | 自然生态·环境保护 |
写作骨架（话题专属）
【总起段】 引入自然世界：
The earth is our home. There are many ecosystems on the earth, such as _, _ and ___.
【展开段】 问题 + 原因 + 行动：
But now some ecosystems are in danger. For example, _ is _ because _. We should _ to protect _. What's more, we can _ by ___.
【总结段】 倡议：
If we all take care of nature, our earth will be more beautiful.