Handouts. Li Zheng, male, vice president of the Ministry of Education of Happy Learning Online Education Technology (Beijing) Co., Ltd., chief lecturer of chemistry in college entrance examination. 2007-20/0/5, Kloc, the first chemistry teaching trainer of New Oriental Education Technology Group, the project veteran of Youneng Middle School of Beijing New Oriental School, the chief lecturer of the college entrance examination chemistry course, and the chief lecturer of the online college entrance examination chemistry course of New Oriental.