1. The opponent is his own brother with the same root. They exist for each other, achieve each other and achieve themselves.

2. Citing an argument can enhance the persuasiveness or literary talent of the article and make the argument more powerful or attractive.

Between 3 and 9- 10, the ninth summarizes that bullies should have a tolerant mind, and the example of Pepsi just illustrates this point.

4、B

5, dream, competition, treasure.

Competition is the key to unlock the treasure of dreams.