Directions:Read the following and choose the title that best expresses the ideas of the passage.
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 the price rises.Of course,manufacturers prefer to sll more goods at increased price.
A.Economic Principles
B.Law of Supply and Demand
C.M ore Goods,Lower Prices
D.Fewer Goods,Higher Prices
该问题,A泛指经济规律,面过宽;C和D只是供需规则的二个单独的方面,不能包含全部,面太窄。正确的答案是B,因为这正是该短文自始至终谈论的主题
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