阶梯倍投最佳方案

简介：Students of this era are quite simple. Those who always go to the office to be punished by teachers are always the things only poor students do. Liu Lei is one of the cadres in the sports committee class. He is sunny and handsome, and his grades are average. Such people are dazzling in the class, but they are considered weird if they always come into the office and get scolded.