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编辑点评： GRE作文考试非常强调逻辑性和完整性，所以作文在问题的分析论证上的用句非常重要，本文为大家例举的是是非问题分析论证句式，大家可以在平时多多积累一些好的句子和用词。 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. A monopoly occurs when one company alone offers a particular food or service and therefore controls the market and price for it. 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. All these changes in China s economic life have brought changes in China s social and cultural life as well, many of which unwanted. If productivity measures the efficiency of an economy, a measure of what an economic system produces is its gross national product , which is the current market value of all final goods and services that a nation produces within a particular period. Current wisdom says that if you want a successful product, you need first to perform detailed market analysis, making sure that there are plenty of people who need the new product and that your entry into the market will be able to gain a significant share of that market. | 
