引言
英语四级考试作为中国大学生必须通过的一项重要考核，其作文部分往往令许多考生感到头疼。为了帮助大家更好地应对这一挑战，本文将提供几篇2021年的英语四级作文必背范文，希望能够对广大考生有所帮助。
范文一：环境保护
题目：Write an essay on “The Importance of Environmental Protection”.
范文：
In recent years, environmental protection has become a hot topic all over the world. It is essential for the survival and development of human beings and our planet. The following reasons can account for its importance.
Firstly, environmental protection ensures the sustainable development of our society. Without a healthy environment, there would be no natural resources for us to use, no clean air for us to breathe, and no clean water for us to drink. All these are fundamental to our daily lives and economic activities.
Secondly, environmental protection contributes to the well-being of future generations. If we do not take actions to protect the environment now, our children and grandchildren will suffer from the consequences. Polluted air, contaminated water, and depleted resources will severely impact their quality of life.
Lastly, protecting the environment helps maintain biodiversity. Many species rely on each other for survival, forming complex ecosystems. If one species disappears, it might cause a chain reaction and endanger other species. Therefore, preserving the environment is crucial for maintaining ecological balance.
To conclude, environmental protection should be a priority for both individuals and governments. Only by taking concerted efforts can we ensure a better future for ourselves and future generations.
范文二：网络安全
题目：Write an essay on “The Importance of Cyber Security”.
范文：
In the digital age, cyber security has become a significant concern for individuals, businesses, and governments worldwide. The importance of cyber security can be understood through the following points.
Firstly, cyber security protects personal information. With the widespread use of the internet, people often share their personal information online, such as bank accounts and social security numbers. If this information falls into the wrong hands, it could lead to identity theft or financial loss.
Secondly, cyber security safeguards business operations. Companies store vast amounts of sensitive data, including customer information and trade secrets, in digital form. A data breach could result in significant financial losses and damage to a company’s reputation. Thus, ensuring cyber security is critical for maintaining business continuity.
Lastly, cyber security supports national security. Governments rely on secure communication channels to exchange vital information related to national defense, public safety, and international relations. Any compromise in these systems could have severe implications for national security and public trust.
In conclusion, the importance of cyber security cannot be overstated. As we continue to advance technologically, it is imperative that we also strengthen our cyber security measures to protect our data and maintain our privacy.
结论
以上两篇范文涵盖了近年来英语四级作文中常见的主题：环境保护和网络安全。掌握这些范文不仅有助于考生在考试中取得高分，更能提高大家的英语写作能力和逻辑思维能力。希望大家能够认真学习和背诵这些范文，并在平时的练习中加以运用，从而不断提升自己的写作水平。