阅读理解
My oldest daughter is on vacation this week.She called last night to tell us that she arrived safely in North Carolina.She said,“Don't get mad but I lost my wallet.”Then she quickly added,“But it's been returned to me！”
She had left the highway to get gas and some food.Her boyfriend was in a hurry to get going because they had a few more hours to drive before reaching their destination. She placed her wallet on the car roof, put the little dog in the back seat, and quickly jumped into the car.Off they went, with the wallet still on the roof!
They were about a half hour away and they came to a toll booth. She reached in her purse for her wallet and couldn't find it. She had a lump in her throat as she remembered leaving it on the roof.
She started to cry. Then, almost immediately, her cell phone rang.It was the local police. They said someone had dropped_off her wallet and she could come to pick it up.
She did and all the vacation money was there. Nothing was missing. She asked for the name of the person who returned it but the police said they couldn't give the information out.
I told my daughter,“It was an anonymous act of kindness and whoever did it is smiling, knowing that you got your wallet back and were able to enjoy your vacation.”
Honest people do exist! This is proof!
Notes：
toll booth收费所
等症状。这一事实说明铁的作用为( )