2021年高考英语作文题目和范文可能会因地区而异，但我们可以参考一些常见的主题和结构来准备。以下是一个基于“环保”主题的预测作文及其范文，供您参考：

### 预测作文题目：
假设你是李华，你的外国朋友John对中国近年来在环境保护方面所做的努力非常感兴趣。请给他写一封电子邮件，内容包括：
1. 简要介绍中国在环保方面的成就（如植树造林、减少污染等）。
2. 分享你所在城市或社区的一个具体的环保行动。
3. 邀请他来中国体验这些环保措施。

### 范文：
Subject: China's Efforts in Environmental Protection

Dear John,

I'm glad to hear that you're interested in China's efforts in environmental protection. I'd like to share some information with you.

In recent years, China has made significant progress in protecting the environment. For example, we have launched large-scale tree-planting campaigns across the country, which not only help to reduce carbon dioxide but also improve air quality. In addition, the government has taken measures to reduce pollution from factories and vehicles, leading to cleaner rivers and skies.

In my city, a community recycling program was initiated last year. Residents are encouraged to sort their waste into recyclable and non-recyclable categories, which greatly reduces the amount of waste sent to landfills. As a result, our city has seen a noticeable improvement in environmental conditions.

If you come to China, you will be able to experience these changes firsthand. I believe you will find them impressive and inspiring. I look forward to your visit!

Best regards,
Li Hua

请注意，这只是一个示例作文，实际考试中的题目可能会有所不同。希望这个例子能帮助你更好地准备高考英语作文。