As a carrier of knowledge,the textbook is an important basis of teaching andlearning. Content design of the textbook should reflect the cognitive process of students' knowl-edge acquisition. Based on concept pathway of“three states particle modeh},we make a deep a-nalysis of content design of“three states particle modem in the junior high school science text-book in Hong Kong,in order to deal with operational questions about content micro-design oftextbook based on concept pathway.

As a means of describing organic reaction mechanism,curved arrows play an im-portant role in organic chemistry teaching. This paper briefly discusses the use of curved arrowsin three different situations. Some errors about the explanation of organic reaction mechanism u-sing curved arrows are analyzed and corrected. Finally,the author's teaching experience aboutcurved arrows is simply introduced.

Classroom tnstructtonal destgn is a very complex teachtng acttvtty,whtch needs tohandle the connection between teachers,students,content,media and many other factors. As avisual instructional design tool,mapping can make complicated instructional design visualization,teaching process briefly and hierarchical,and all kinds of teaching factors clear,so it is consid-eyed as a blueprint of classroom teaching. This paper introduces three classical forms of mapping,and develops teaching map. Furthermore,application of teaching map in chemistry instructionaldesign is discussed with the case of ionic reaction based on ideas of new chemistry curriculum re-form.

Based on the principles of green chemistry,the importance and necessity of build-ing green chemistry thinking was preliminary analyzed in college chemistry experiment teaching.With many years of teaching practice,from three aspects of the experiment teaching ideas,con-tent and management,the approach of establishing the green chemistry thinking was further in-vestigated during the college chemistry experiment teaching process. From the view of the experi-ment teaching content greening,the construction of green chemistry thinking was expressly discussed during the college chemical experiment teaching process.