根据短文内容判断正误。

One day, Mr. and Mrs. White went shopping by car. They stopped their car near a shop. They bought 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 to help them. The policeman was very friendly. He started to open the door of the car for them. Just then a man came up and shouted," 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.