单选题 The market is a concept (概念). If you are growing tomatoes for sale, you are producing for the market. You might sell some to your neighbors and some to the manager of the supermarket. But in either case, you are producing for the market. If people stop buying tomatoes, you will stop producing them.
If you take care of a sick person to get money, you are producing for the market. If your father is a worker or a driver or a doctor, he is producing goods or service for the market.
When you spend your income, you are buying things from the market. You may spend money in shops, supermarkets, gas stations and restaurants. Still you are buying from the market. When the boss hires you to drive a truck, he is buying your labor in the market. The market may seem to be something abstract (抽象). However, it's very concrete to each person who is making and selling something. It's telling if nobody buys your tomatoes, it won't be long before you get the information. It's telling you that you are using energies and resources in doing something the market doesn't want you to do.

单选题 Which of the following CANNOT produce for the market?
A. Growing rice for sale. B. Writing a book for readers,
C. Making the bed for oneself. D. Working as manager of a company.

单选题 You are buying from the market when you ______.
A. look after you children
B. eat or drink at a restaurant
C. borrow a book from the library
D. ask your manager for a sick leave

单选题 In what way is the market abstract?
A. It tells you whether to continue growing tomatoes.
B. People use energies and resources in doing anything.
C. You can buy almost anything you need in the market.
D. Having a job seems to have nothing to do with the market.

单选题 "Concrete" probably means ______ in the passage.
A. possible B. impossible
C. almost the same as abstract D. the opposite of abstract

单选题 Which may be the best title of the passage?
A. What Is the Market B. Selling and Buying
C. Things the Market Sells D. What Can the Market Do for You