题目内容：
QuestionsRead the article below about price system.
For each question (23-28) on the opposite page, choose the correct answer.
Mark one letter (A, B or C) on your Answer Sheet.
Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed among buyers. The price system of the United States is a very complex network composed of the prices of all the products bought and sold in the economy as well as those of a myriad of services, including labor, professional transportation, and public utility services.
The interrelationships of all these prices make up the "system" of prices. The price of any particular product or service is linked to a broad, complicated system of prices in which everything seems to depend more or less upon everything else. If one were to ask randomly selected individuals to define "price", many would reply that price is an amount of money paid by the buyer to the seller of a product of service or, in other words, that price is the money value of a product of service as agreed upon in a market transaction.
This definition is, of course, valid as far as it goes. I or a complete understanding of a price in any particular transaction,much more than the amount of money involved must be known. Both the buyer and the seller should be familiar with not only the money amount, but with the amount and quality of the product,or service to be exchanged, the time and place at which the exchange will take place and payment will be made, the form of money to be used, the credit terms and discounts that supply to the transaction, guarantees on the product or service, delivery terms,return privileges, and other factors. In other words, both buyer and seller should be fully aware of all the factors that comprise the total " package" being exchanged for the asked -- for the amount of money in order that they may evaluate a given price.
What is the main idea of the passage? A．The Inherent Weaknesses of the Price System
B．The Complexities of the Price System
C．Credit Terms in Transactions
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