The general demonstration materials in this paper mainly include the following categories:

1. Statistics: This is the most direct and convincing argument. For example, you can quote data published by authoritative organizations or research institutions, such as the World Health Organization and the United Nations. These data are usually subject to strict scientific statistics and analysis, and have high credibility.

2. Historical facts: Historical facts are an important basis for argument. You can support your point of view by quoting historical events, people's deeds, etc. For example, if you are writing a paper on leadership, you can cite the deeds of great leaders in history to prove your point, such as Lincoln and Churchill.

3. Expert opinions: Expert opinions are often highly authoritative. You can support your paper by quoting the opinions of experts in related fields. For example, if you are writing a paper on environmental protection, you can quote the opinions of environmental experts.

4. Case analysis: Prove your point through specific cases. This method can make your paper more convincing. For example, if you are writing a paper on education reform, you can cite a case of education reform in a certain country or region to prove your point.

5. Theoretical basis: You can cite relevant theories or research to support your thesis. This method can make your paper deeper and wider. For example, if you are writing a paper on psychology, you can quote Freud's psychoanalysis theory to support your point of view.

The above five demonstration materials can be used flexibly, and the appropriate demonstration materials can be selected according to the theme and content of the paper. At the same time, we should pay attention to the authenticity and reliability of arguments and avoid using false or inaccurate arguments.