1. Technology products: such as mobile phones, computers, smart homes, etc. These products are very common in modern life, and many people have used or heard of them. You can choose a specific product and introduce its appearance, function and usage, so that readers can have a deeper understanding of the product.

2. Health care: for example, how to maintain health, lose weight, beauty, etc. These topics are closely related to people's health and appearance, and many people are concerned about these issues. You can choose a specific health care method or lifestyle, and introduce its principle, effect and matters needing attention to help readers improve their quality of life.

3. History and culture: such as historical events, cultural traditions, places of interest, etc. These themes can help readers understand the development process and cultural details of human civilization and improve their cultural literacy. You can choose a specific historical event or cultural tradition and introduce its background, development and influence to help readers better understand history and culture.

4. Natural environment: such as animals and plants, natural landscape, environmental protection, etc. These themes can help readers understand the importance of natural environment and ecological balance and enhance their awareness of environmental protection. You can choose an animal, plant or natural landscape and introduce its characteristics, growth environment, protection value, etc. Help readers better understand the natural environment and ecological protection.

Skills of writing expository articles:

1, choose a good theme: choosing a theme closely related to real life can better attract readers' interest and attention. At the same time, you should choose a topic that you are familiar with and have relevant knowledge, so that you can be more confident and accurate in the writing process.

2. Outline: Before writing, make a detailed outline, divide the things to be introduced into several aspects, and arrange them in logical order to ensure the clear structure and distinct levels of the article.

3. Appropriate use of examples: In the explanatory text, appropriate examples can better explain the problem and make it easier for readers to understand. So in the process of writing, you can give some examples to help explain.

4. Concise and clear language: The purpose of expository writing is to make readers understand and know things better, so the language should be concise and clear, and avoid using too complicated words and sentences. At the same time, we should pay attention to the accuracy and objectivity of language, and don't use subjective assumptions or exaggerated expressions.

5. Clear structure: the structure of the explanatory text should be clear, first introduce things as a whole, and then gradually expand to various details. In the process of writing, we should pay attention to the transition and cohesion between paragraphs to make the article more fluent and coherent.

6, illustrated: In the explanatory text, appropriate pictures and charts can better explain the problem and enhance the persuasiveness of the article. So in the process of writing, you can add some pictures and charts to help explain.