阅读短文, 判断正误。

One day Mr. and Mrs. White went shopping by car. They stopped their car near a shop. They bought(买)a lot of things and they wanted to put the things into the car. But Mr. White couldn't open the door of the car, so they asked a policeman for help. The policeman was very friendly. He started to open the car for them. Just then a man came up and shouted(喊), “What are you doing with my car?”Mr. and Mrs. White had a look at the car's number and they were frozen(惊呆了) there. It wasn't their car.