四、改错

　　Most people work to earn a living and they

　　produce goods and services. Goods are either

　　agricultural (like maize) or manufactured (like

　　cars). Services are such things like education, 1._________

　　medicine, and commerce. These people provide 2.__________

　　goods; some provide services. Other people provide

　　both goods or services. For example, in the same 3.__________

　　garage a man may buy a car or some service which

　　helps him maintain his car.

　　The work people do is called as economic 4.__________

　　activity. All economic activities taken together make

　　up the economic system of a town, a city, a country,

　　or the world. Such economic system is the sum-total 5.__________

　　of what people do and what they want. The work

　　people do either provides what they need or provides

　　the money with that they can buy essential 6.__________

　　commodities. Of course, most people hope to have

　　enough money to buy commodities and services which

　　are essential but which provide some particular 7. __________

　　personal satisfaction, such as toys for children, visits 8. __________

　　the cinema, and books.

　　The science of economics is basic upon the facts 9. __________

　　of our everyday lives. Economists study our everyday

　　lives and the general life of our communities in order

　　to understand the whole economic system of which we

　　are a part. They try to describe the facts of the

　　economy in which we live, and to explain how it

　　works. The economist methods should of course be 10. __________

　　strictly objective and scientific.

(责任编辑：马俊茂)