18. The function of an example (1) is to prove that "although it has great benefits, it cannot occupy all the scenery". (2 points)

19. Paragraph ③: Every successful person can become the king of his own kingdom. ( 1)

Paragraph (4): When a person's ambition is hard to be rewarded or his talent is not satisfied, he can still be king. ( 1)

Paragraph 5: In daily life, everyone can be king. ( 1)

20. The answer is not unique. It can be closely related to the saying that "when a person's ambition is hard to pay or his talent is not satisfied, he can still be king". Just give an example and make a simple analysis. (3 points)

2 1. People who feel inferior (or proud) in their lives.