When you enter a supermarket, you see shelves full of food.

When you enter a supermarket, you see shelves full of food. You walk between the shelves. You carry a shopping basket w ith your food in it.
You probably hear soft, slow music as you walk between the shelves. If you hear fast music, you walk quickly. The supermarket plays slow music. You walk slowly and have more time to buy things.
Maybe you go to the meat department first. There is some meat on sale, and you want to find it. The manager of the supermarket knows where customers enter the meat department. The cheaper meat is at the other end of the meat department, away from where the customers enter. You have to walk by all the expensive meat before you find the cheaper meat. Maybe you will buy some of the expensive meat instead of the meat on sale.
The department selling milk and milk products such as butter and milk powder is called the dairy department. Many customers like milk that has only a little butter fat in it. One store has three different jars of low fat milk. One says “1 percent fat” on the jar. The second says “99 percent fat free”, the third says “Low fat” in big letters and “1%”in small letters. As you can see, all the milk has the same amount of fat. The milk is all the same. However, in this store the three jars of milk cost three different amounts of money. Maybe the customers will buy the milk that costs the most.
Most of the food in supermarkets is very pleasing. It all says “Buy me!” to the customers. The expensive meat says “Buy me” as you walk by. The expensive milk jar says “Buy me! I have less fat.”
77. The manager of the supermarket knows______.
A. which customers like low fat milk 　　　　　　　B. which customers like slow music
C. where customers enter the meat department 　　　D. where customers come from
78. When you walk by the expensive meat, maybe you will______.
A. buy some 　　　B. try to find fresh fruits 　　　C. look for low fat milk 　　D. just walk on
79. There are three different jars of low fat milk and_____.
A. one has more fat than the other two 　　　  B. they are almost the same amount of money
C. one has less fat than the others 　　　　   D. they all have the same amount of fat
80. Supermarket managers make the food pleasing so that_____.
A. there will be more buyers 　　　B. buyers will be proud
C. it is good and expensive 　　　D. they can raise the prices