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编辑点评： 大家在准备GRE作文的时候，一定会背记一些经典的句式，不仅能在考试中运用到，也是锻炼自己组织句子、段落的一个好方法。本文就为大家提供了一些GRE作文中涉及到是非问题分析论证的时候可以运用的经典句子，希望对大家的备考有所帮助。 1、When the demand for something is greater than its supply, producers and suppliers will sense the possibility of making a profit the excess of revenues over expenses is the profit. 2、As the case illustrates, competition takes four general forms: pure competition, monopoly, monopolistic competition, and oligopoly. 3、The classic example of pure competition occurs with a commodity, like wheat or corn, that has so many producers that no one of them can control its selling price. 4、A monopoly occurs when one company alone offers a particular food or service and therefore controls the market and price for it. 5、Private restaurants serve gourmet food for $70 per person; incentives boosted agricultural production 25 percent and industrial output 80 percent in just three years; farmers are encouraged to raise as much as they can on their own plots, and some become almost rich in the process. 6、All these changes in China s economic life have brought changes in China s social and cultural life as well, many of which unwanted. | 
