听材料,回答第1-3题。 1. When does the conversation take place? A. At the beginning of a class B. In the middle of a class C. Between the classes 2. Why didn't the boy answer any question on the homework? A. He found them difficult B. He read the wrong chapter C. He forgot to read the chapter 3. How did the boy get to school this morning? A. On foot B. By bus C. By bike