A、The teachers did lots of writing on the board. B、The students were professors from a university. C、The teachers were invited t

This was no ordinary class. The students who came together were all science or engineering professors at Cornell University. They had interrupted their research to accept an invitation to take part in an unusual experiment: "an interesting week of poetry" .This class was part of a study to answer the questions: Why is science difficult for many non-science students? What can teachers learn about teaching if they take a class that is not in their field?
    The students in the poetry class listened to lectures and took notes. They had reading tasks and had to write three short papers. All students noticed one thing — the importance of spoken words. In science and engineering classes, the instructors put tables and drawings on the blackboard. But in this poetry class, the instructors just talked. They didn’t write anything on the board.
    The scientists and engineers noticed one similarity between science and poetry. In both subjects, students need to find layers of meaning. Some layers are simple, clean, and on the surface; other layers are deeper and more difficult. This search for different levels of meaning doesn’t happen much in undergraduate science classes, but it is important later, in graduate school. And it is always important in humanities.
    Both the poetry instructors and their students learned something about teaching from this experience. One poetry instructor, for example, now sees the importance of using information as he teaches. Most of the scientists agreed on several points. First, humanities classes might help science students to see patterns and decide which information is important. Second, the poetry class was fun. One engineer decided, "We need to change the way we teach engineering to make it an enjoyable experience for students."
    But perhaps the most important result of the experience was this: All of the professors began to think about how they teach and how they can teach better.
Questions 22 to 25 are based on the passage you have just heard.
22. What do we know about this unusual class?
23. What was the experiment designed to find out?
24. What do we learn about finding levels of meaning?
25. What did the science professors learn from the experiment?