Question 25 is  based on the passage you have just heard.

    Jody Harbert is a diet and nutrition expert who travels around the state to speak in middle and high schools. （22）She primarily speaks to students in health classes, but sometimes the school will arrange for her to speak to several different groups of girls. （23）Her biggest concern is the emphasis American culture places on thinness and the negative ways this affects girls today. Jody has a Ph.D. in nutrition, but more important, she has personal experience. Her mother taught her to diet when she was only eight years old. Jody has created several different presentations which she gives to different types of audiences, and she tries to establish an emotional connection with the students so that they will feel comfortable asking questions or talking to her privately. （24）She shows them pictures and images from popular culture of beautiful women and explains how computers are used to make the women look even more thin and beautiful than they are in real life. She describes how the definition of beauty has changed over the years and even from culture to culture. She then talks about health issues and the physical damage that can occur as a result of dieting. Finally, she addresses self-respect and the notion that a person’s sense of beauty must include more than how much a person weighs. （25）Sometimes, Jody feels that she succeeds in persuading some students to stop dieting. Other times, she feels that she fails.

25. What is Jody Harbert’s main purpose in giving her speeches?

解析：D。原文中提到Jody有时觉得自己成功劝服女生停止节食，有时又失败了，说明她的主要目的就在于劝女生不要节食，故正确答案为D。