听力原文：

Linda was very worried because she couldn’t find her schoolbag. Yesterday she went to take dance training with her schoolbag on her back after school. She couldn’t have left it at the dancing room, because she went to a picnic with it after that. In the park, she put her schoolbag next to Mary’s. Then she sang and played with her friends very happily; they enjoyed themselves. She didn’t get home by bike until 8:00 last night. When she wanted to do her homework, she couldn’t find her schoolbag. Though there was nothing valuable in it, she couldn’t do her homework without it. Her mother suggested she call her friend Mary; maybe she picked up her schoolbag.

答案: 6. B