Test analysis: Lin Senhao and Huang Yang, who live in the same dormitory, are dissatisfied and poison each other, which shows that this student is not tolerant enough. He tells us to be tolerant in the face of estrangement and misunderstanding and poison at will, which shows that his moral awareness is low and his legal awareness is weak, so he tells us that we must improve our moral quality and form the habit of abiding by the law. ② It has nothing to do with material expression, ③ it is wrong. The answer is C.