Teacher Ding is a well-known expert in English for postgraduate entrance examination, CET-4 and CET-6 in China, the chief lecturer of a little educational English, and the chief lecturer of many authoritative postgraduate counseling institutions in China. I have coached almost all English exams in China and know the law of proposition like the back of my hand. There are more than 500,000 students, and millions of candidates know about it through the Internet and other channels, with remarkable achievements. He is a core member of the CET-4 and CET-6 marking group in East China, and gave him more targeted counseling. The pioneer of the theory of super-intensive reading of foreign periodicals, super-precise solution of real questions, lexical hyperlinks and writing highlights; A leading figure in the research field of English and American foreign language periodicals; China is the first person in the field of CET-4 and CET-6 anti-proposition, and has successfully cracked the password of CET-4 and CET-6 English proposition for many times. The reference answers published at the first time after many years of examinations are correct, the only ones in China, and they are far ahead of the post-examination answers pk of major counseling institutions. It can be seen that Mr. Ding is a leader in the same industry.