基础题
基础题：
题目：请根据以下模板，写一篇关于“如何保持健康”的短文。
模板：
1. 开头：It is widely acknowledged that [主题] is of great importance.
2. 主体：Firstly, [建议1]. Secondly, [建议2].
3. 结尾：In conclusion, [总结].
解答过程：1. 填入主题：keeping healthy。
2. 填入建议1：we should exercise regularly。
3. 填入建议2：we need to have a balanced diet。
4. 填入总结：a healthy lifestyle is essential for everyone。
成文：It is widely acknowledged that keeping healthy is of great importance. Firstly, we should exercise regularly. Secondly, we need to have a balanced diet. In conclusion, a healthy lifestyle is essential for everyone.
变式题：
题目：将上述基础题中的“保持健康”主题替换为“保护环境”，并尝试在主体部分增加一个原因解释，使内容更丰富。
解答过程：1. 开头替换：It is widely acknowledged that protecting the environment is of great importance.
2. 主体扩展：Firstly, we should reduce plastic usage.
This is because plastic waste pollutes the ocean. Secondly, we need to plant more trees.
3. 结尾替换：In conclusion, environmental protection is our shared responsibility.
成文：It is widely acknowledged that protecting the environment is of great importance. Firstly, we should reduce plastic usage. This is because plastic waste pollutes the ocean. Secondly, we need to plant more trees. In conclusion, environmental protection is our shared responsibility.