根据短文内容，回答下面的问题
What is a supermarket? In the dictionary, a supermarket is a large self-service department store. Some supermarkets have two floors. When you enter such a supermarket, an elevator will take you to the second floor. Here you can buy things such as CDs, pens, clothes, TVs and refrigerators. After you have collected the things you want to buy on the second floor, you can go downstairs to the first floor where food and drinks are sold. You can also buy fresh fruit, vegetables and meat on this floor.
People like to go shopping in the supermarket. Here are some of the reasons.
First, the prices are reasonable. The prices are lower than in special shops and you can choose whatever you want, without going place to place.
Second, the service is excellent. You can walk around freely and no one will ask you “What can I do for you?” If you can’t find something, just ask a service person and he or she will tell you where it is at once.
Third, the quality is good. If you get home and find the food has gone bad, you can return it and they will say sorry and change it for you.
Nowadays many people don’t have much time to walk from one shop to another, so people choose to go to the supermarket in order to save time and money.
What’s more, if you don’t want to buy anything, you can just come and look around in the supermarket. It’s a good place to have a walk.