Establishing the concept of big education, stepping out of the closed and narrow classroom, expanding the space for students' homework and guiding students to family, society and life through homework can not only solve practical problems, but also cultivate students' ability to ask, analyze and solve problems, which is more conducive to the formation of students' scientific literacy. Students can also conduct social surveys and analyze the survey data with a scientific eye, so as to further understand the world around us.

Teachers should dig up materials that can inspire students' investigation and practice in real life, create a free and relaxed atmosphere, guide students to put forward new ideas, methods and schemes, and write down these investigation and practice things, so as to improve students' interest in learning and enhance their thinking ability. In these investigative practical assignments, students seek truth from facts and return to the "big classroom" of life. Through my own investigation, calculation, comparison, analysis and summary, I have not only learned knowledge, but also exercised my ability, which is full of the flavor of the times of life.