4.为短文选择合适的标题

　　There is a simple economic principle used to determine prices. It is called the law of supply and demand. Supply means the amount of, or access to, certain goods. Demand represents the number of people who want those goods. If there are more goods than wanted, the price of them falls. On the other hand, if the demand for those goods is much greater than the supply, then price rises. Of course manufacturers prefer to sell more goods at increased prices。

　　A. Economic Principles

　　B. Law of Supply and Demand

　　C. More Goods, Lower Prices

　　D. Fewer Goods, Higher Prices

　　该问题中，A 泛指经济规律，过于宽泛；C和D只是供需规则的两个单独方面，不能包含全部，过于狭隘。正确答案是B，因为供求决定价格才是短文自始至终讨论的主题。

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