Part I Listening Comprehension （20 minutes）(略)
Part Ⅱ Reading Comprehension （35 minutes）
Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices mared A）, B）, C） and D）.You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center.
Passage One
Questions 21 to 25 are based on the following passage:
There are three basic ways in which individual economic units interact with one another. They are the market system, the administered system, and the traditional system.
In a market system, individual economic units are free to interact among each other in the market place. Transactions may take place through barter or money exchange. In a barter economy,real goods such as automobiles, shoes, and pizzas are traded against each other. Obviously, finding somebody who wants to trade an old car in exchange for a sailboat may not always be an easy task. Hence the introduction of money as a medium of exchange eases transactions considerably.
An alternative to the market system is administered control by some agency over all transactions. This agency will issue laws or commands as to how much each goods and service should be produced, exchanged, and consumed by each economic unit. Central planning may be one way of administering such an economy. The central plan drawn up by the government shows the amount of each commodity produced by the various firms and distributed to different households for consumption.
In a traditional society, production and consumption patterns are governed by tradition. Each person′s place with the economic system is fixed by parentage, religion, and custom. Transactions take place on the basis of tradition, too. People belonging to a certain group or caste may have an obligation to care for other persons, provide them with food and shelter, care for their health,and provide for their education. Clearly, in a system where every decision is made on the basis of tradition alone progress may be difficult to achieve.
21. What is the main purpose of the passage?
A） To explain the science of economics.
B） To outline types of economic systems.
C） To argue for the superiority of one economic system.
D） To compare barter and moneyexchange markets.
22. In the second paragraph, by which of the following could the word "real" best be replaced?
A） High quality.
B） Concrete.
C） Utter.
D） Essential.
23. According to the passage, a barter economy can lead to
A） rapid speed of transaction
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