At the beginning, because of the theory of applying for the exam, I signed up for the public examination education and training course of nitrogen introduction. After more than two months of study, I have greatly improved the application of theory. On my first day of class, the nitrogen introductory lecturer helped me to do the training of accelerating and strengthening memory, and recommended me to talk and comment for half a month after class, which made me develop the habit of accumulating current events. To tell the truth, the nitrogen introductory lecturer taught me very well.