朗读短文并回答问题。本题5分。I have a friend who has a large police dog named Tom. Every Sunday afternoon my friend takes Tom for a long walk in the park. One Sunday afternoon a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Tom for his walk. But the visitor still stayed. Tom became very worried about his walk in the park. He walked around the room several times and then sat down directly in front of the visitor and looked at him. But t