一、话题词汇
1. 生态系统
2. 气候
3. 起作用；行动；扮演
4. 伤害；损害
5. 知识
6. 环境的
7. 导致

1. ecosystem
2. climate
3. act
4. harm
5. knowledge
6. environmental
7. lead to

二、佳句仿写
8.【教材原句】Each ecosystem has a role to play and helps keep the balance between all its members and the greater environment. ( have a role to play )
→仿写:每个人在湿地保护中都能发挥作用。

9.【教材原句】Forests make up nearly a third of the earth's land area. ( make up )
→仿写:像不乱扔垃圾这样的小行动构成了保护海洋的大作为。

8. Everyone has a role to play in wetland protection.
9. Small actions like not littering make up big efforts to protect the ocean.

10.【教材原句】It is meaningful to join an environmental group and work as a volunteer. (It is + adj. + to...)
→仿写:每年种树来保护森林是有意义的。

10. It is meaningful to plant trees every year to protect the forest.

美丽的草原对地球生态很重要,请你以“Protecting the Grasslands”为题,根据下面的提示写一篇80词左右的短文(开头已给出,不计入总词数)。
提示:(1)草原的重要性(至少两点);
(2)人类活动对草原的危害;
(3)保护草原的措施。
参考词汇:graze 吃草
Protecting the Grasslands
Grasslands are important.

They provide good places for many animals to graze, and they can also prevent soil loss and reduce sandstorms to keep the balance of the ecosystem. However, too much human activity does great harm to grasslands: people overgraze cattle and even turn grasslands into farmland, making grasslands smaller and a lot of land turn to desert.
To solve this problem, we should control the number of grazing animals, plant more grass, and call on more people to protect grasslands. Small actions can make a big difference.

本题要求写一篇主题为保护草原的英语短文，写作需覆盖全部提示要点：1. 先阐述草原的至少两点重要性，比如为食草动物提供栖息地、防止水土流失和沙尘暴，维护生态平衡；2. 说明人类过度放牧、不合理开垦等活动对草原造成的破坏，比如草原退化、土地沙化；3. 给出对应的可行保护措施。写作要使用符合八年级水平的词汇，控制总词数在80左右，语句通顺逻辑连贯。

第2步 列提纲
本文适宜采用的作文结构为“总—分—总”。
结构
开头：草原对动物和生态的重要性
Many animals live there...
Without grasslands, soil might be washed away...
中间：人类活动的影响、保护措施

Now people are hurting grasslands...
To save the grasslands, our government makes rules...
结尾：书写结语，发出呼吁
Let’s do something...

参考范文：
Grasslands are one of the most important parts of our natural ecosystem.
Many different wild animals live there, so grasslands are their perfect home. Grass roots can hold the soil tightly, so without grasslands, lots of soil might be washed away by heavy rain easily, and more land will turn into dry deserts.
Now people are hurting grasslands in different ways. Some farmers raise too many sheep and cows on the grasslands, and some people dig up grassland to grow crops. More and more grasslands are becoming smaller and the land is getting sandier. To save the grasslands, our government makes rules to control the number of farm animals on grasslands, and also builds many special reserves to help grasslands grow back well.
Grasslands are our precious natural treasure. Let's do something small to protect grasslands from now on, and we can make our earth more beautiful together.

本题要求按照“总-分-总”的结构完成草原保护主题的英语写作，写作逻辑贴合给出的提纲框架：
1. 开头总起：点明草原的核心生态价值，先说明草原是大量野生动物的栖息家园，再补充草原可以固定水土，避免土壤被雨水冲刷流失，凸显草原对整个生态系统的重要意义。
2. 中间分述：先介绍当下人类的不合理活动，比如过度放牧、无序开垦等行为正在破坏草原，引发草原退化、土地沙化的问题；再对应介绍政府出台相关管控规则、建立草原保护区等已落地的保护措施。
3. 结尾总结：发出环保呼吁，号召所有人行动起来，共同守护草原生态。
参考范文适配八年级词汇难度，完全贴合提纲给出的提示句展开写作。