Selenium is an important trace element for human health. Lack of selenium will impair the function of immune system. Supplement of amount of selenium can strengthen the cellular immunity, humoral immunity, humoral immunity and nonspecific immunity. This paper introduces the immunity function of selenium, and discusses the effects of selenium on prevention and cure of diseases.

Combustible "ice", which is buried underneath the ocean and frozen soil of cold zone, is an exploitable energy. It is a gas or methane hydrate and its limiting formula is 8X·46H₂O. This article presents a brief introducation to the fundamental konwledge about the history of its discovery and its strucyure of combustible "ice".

According to the classification theory about: the study result in modern studying psychology, and the characteristic of chemistry, the article expounds and analyses the classification about the result of studying chemistry, the definition of classification about every study, psychological essence, expression of behavior and methods of surveying. Under the guide of classification theory about, the result of studying, and in terms of the practice of secondary classroom teaching of chemistry. The article also puts forward our recognition and realization on how to state teaching aims scientifically, how to design teaching process, choose methods of teaching and how to make teaching measurement.

This article introduced the new ways of training trainees' experiment ability and raising the experiment teaching quality effectively by understanding trainee’ circumstances, rectifying teaching contents, optimizing teaching methods and promoting promoting exchange etc.