【英语2级听力】一次成功的交易-A Successful Trade（在线收听）

It is lunch time. The kids go out to eat. They are excited and hungry. Paul has a ham sandwich. He does not like ham. He wants a tuna sandwich. Sarah has a tuna sandwich. She thinks tuna is smelly. She wants a ham sandwich. Paul and Sarah meet up. They trade their sandwiches. They get what they want.