好的，以下是一篇关于环境保护的四级英语作文示例，包含开头和结尾：

Title: The Importance of Environmental Protection

Introduction:

As the world rapidly develops, environmental issues have become a pressing concern for everyone. It is widely acknowledged that environmental protection is not only beneficial to our current generation but also essential for future generations. Therefore, it is high time we took effective measures to protect our environment.

Body Paragraphs (not included in this example):

In these paragraphs, you could discuss specific problems like pollution and deforestation, and possible solutions such as recycling and tree planting initiatives.

Conclusion:

To sum up, protecting the environment is an urgent task that requires immediate attention from individuals, communities, and governments alike. Only through collective efforts can we ensure a sustainable and healthy planet for all living beings. Let us all take responsibility and contribute to creating a cleaner and greener world.

This essay follows a simple structure with a clear introduction and conclusion, which can be adapted for various topics by replacing the body paragraphs with content relevant to the chosen subject.