Test analysis: Middle school students are in a period of great psychological difference with their parents. During this period, children and parents often have different views on some issues, resulting in estrangement and a "generation gap". (1) Entering adolescence, due to physiological and psychological changes, self-awareness and independent awareness are enhanced, and the cognitive level is constantly improved, which is easy to show feelings and independent wishes. ⑵ Because of the differences with their parents in life experience, roles, hobbies, ways of thinking and cognitive level, the two generations have different views on many issues. (3) Parents don't know enough about the characteristics of their children's adolescence, the education methods are outdated, and children's attitude towards their parents is improper, which inevitably leads to contradictions. ② Family atmosphere has little effect on children's physical and mental health. This is wrong. Parents are children's first teachers, and family atmosphere has a great influence on children's physical and mental health. ③ The root cause of poor communication lies in parents. This is also wrong. The key is how children treat them.

Comments: If you choose the right question, you can try to eliminate the wrong options by exclusion, and finally determine the correct answer. But there are obvious mistakes in this question, and the answer can be determined by simple elimination.