Please put the passage2 of listening comprehension into Chinese Dirty Professors Professor Sorrels put on a rain coat on a sunny afternoon. He wore a strange smile. On the campus, we saw some other professors acting in the same way. Out of great curiosity, we Chinese students went to the lawn in front of the cafeteria to see what would happen to them. Some American students held something colorful in their hands. All of a sudden, we saw two students rushing toward a teacher and smearing something on his head. There was great laughter and excitement. All the teachers there had become colorful figures. Later we were informed that that was a special way for the students to show their respect for their beloved teachers—smearing chocolate on their faces and heads!