镜头之一：有一天，初一两个班在上合班课，可是黑板还没有擦，学生们互相看着，谁 也不好意思上去擦掉，陈某本想去擦，但在两个班同学面前也犹豫起来：我若去擦，会不会 有人说我太积极?　　镜头之二：方某和李某同桌多年，老师让方某帮助学习困难的李某。但有一天，李某为 ? One of the shots: One day, the first and second classes were in the joint class class, but the blackboard was not wiped. The students looked at each other, who was embarrassed to wipe it away. Chen wanted to wipe it, but in two classes. In front of classmates hesitated: If I go to rub, will someone say I’m too active? The second lens: Fang Mou and Li Mian at the same table for many years, the teacher asked Fang to help learning difficult Lee. But one day, Lee?