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How to write a junior high school science and technology composition
The writing of junior high school science and technology composition can be carried out from the aspects of topic selection, investigation, hypothesis, experiment and conclusion analysis.

1. Choose a topic: First, you need to choose a topic that you are interested in or familiar with as the topic of your paper. This can be a concept you learned in science class or a phenomenon you observed in your daily life.

2. Investigation: After determining the theme, you need to do a lot of investigation and study, understand the background knowledge of this theme, and understand the relevant scientific principles and existing research results. You can use library books, online materials, and even ask teachers or experts.

3. Make assumptions: According to your topic and survey, you can make one or more assumptions, that is, your predictions or opinions on the topic. For example, if you are interested in the relationship between plant growth and light, you can put forward the hypothesis that different light intensities have an effect on plant growth.

4. Conduct experiments: In order to test your hypothesis, you need to design and execute one or more experiments. Therefore, it is necessary to define the purpose of the experiment, select suitable experimental materials, design and analyze reasonable experimental steps.

5. Analysis and conclusion: After the experiment is completed, you need to analyze the experimental results and verify your hypothesis according to the results. If the experimental results support your hypothesis, you can draw a conclusion; If the experimental results don't support your hypothesis, you may need to reconsider your hypothesis or redesign the experiment.

The role of scientific papers:

1. Popularize scientific knowledge: The writing of scientific papers is an essential link in scientific research. Scientific research achievements, new technologies, new processes and new methods can be spread to more people in written form, scientific knowledge can be popularized and applied, and the scientific level of the whole society can be improved.

2. Promote academic exchanges: The publication of scientific papers provides an exchange platform for academic circles, allowing different research results, viewpoints and opinions to be displayed and discussed. This not only helps to promote the development of academic research, but also helps to improve the overall level of academic circles.

3. Stimulate innovative thinking: Writing small scientific papers requires innovative thinking and the ability to think independently. By discovering, analyzing and solving problems, we will constantly stimulate new innovative thinking and create more value for society.

4. Promote scientific and technological progress: The publication of scientific and technological papers plays an important role in promoting scientific and technological progress and industrial upgrading. The popularization and application of new scientific and technological achievements and technical methods can promote scientific and technological progress and industrial development, and improve social productivity and people's living standards.

5. Cultivate scientific literacy: writing small scientific papers requires scientific literacy and scientific research ability. By participating in scientific research and practice, we can cultivate and improve our scientific literacy and improve our comprehensive quality and social competitiveness.