A、Material assigned by the teacher for reading. B、Material directly related to discussion in class. C、Material linked to the job

A new book is sure to be discussed and debated at colleges this fall. The book is called My Freshman Year-, What a Professor Learned by Becoming a Student. The writer is Rebekah Nathan, which is not her real name. Rebekah Nathan, who is in her fifties, is a professor of humanics at a university in the United States, for which her name is "Any U".
     (16)The professor wanted to know why many of her students did not complete their work or ask for help, so she decided to do a research project. She got the approval of the university ethics committee, which considers moral and legal issues in studies.
    In the spring of 2002, she applied to her own university under the name "Rebekah Nathan" and was admitted. She lived in student housing, took five classes during her first term and two in the second semester and also played sports. She did pretty well, although she got one C, a mark of average. In My Freshman Year, she does not identify any students by name, but she does discuss what they told her about their lives.(17)Rebekah Nathan writes that students do not have enough time to be interested in their classes.
    They are busy with activities and jobs and try to learn only as much as they have to.(18)But she says they will read the material if it is directly linked to what is being discussed in class.(19)The professor says her year as a student changed the way she teaches. She gives less reading now, asks questions designed to get students to speak more and offers help as well. And she says she is no longer offended if a student falls asleep.
16. Why did Rebekah Nathan apply to be a freshman?
17. What does Rebekah Nathan find in her freshman year?
18. Which kind of material will the students read?
19. What is changed for Rebekah Nathan after one year as a freshman?