For example, the textbook from students around the easiest most familiar with air, oxygen, water, carbon dioxide and other substances begin, combined with a common introduction of iron and other metals, limestone and iron ore and other minerals, recognizing the close relationship of these substances and human, and then From the macro to enter the micro, understanding material microscopic structure, and finally the students into the field of environment, energy, materials, so that students are learning the importance of science, experience the value of scientific disciplines.