Test analysis: according to the writing content and expression needs of the column of "Calligraphy Masters" in the class blackboard newspaper, complete the questions in the horizontal line. The most suitable is C. Intensive reading of three books on physical changes. This kind of test questions pay attention to the language sense of paragraphs and the ability to analyze and summarize. In the usual learning process, we should not only learn, but also accumulate, and more importantly, apply what we have learned.