GRE写作的这些论证方法

　　一、演绎推理论证法

　　将一个具体的事例运用到一个一般性原则从而得出结论。

　　论点:Demand for this product wii go up。

　　论据:The price of the product is sliding.

　　推理依据:Whenever prices of a product go down , demand for it rises.

　　二、定义法

　　界定一个概念的关键内涵;或者认定某个事物符合某个定义，从而得出结论。例如:

　　论点:Radical feminists are not good citizens.

　　论据:Radical feminists lack family values.

　　推理依据:Family values characterize the good citizes.

　　三、因果关系论证法

　　将一个判断放入一个因果关系中，指出它或者是原因，或者是结果。例如:

　　论点:The internet may be causing depression.

　　论据:When a group of people increased their use of the Internet , they felt depressed.

　　推理依据:There are no other reasons for the groups depression.

　　四、归纳推理论证法

　　从若干个具体事例中推出共性的一般结论。如:

　　论点:Everyone likes the movie.

　　论据:I know three people who like the movie.

　　推理依据:Three eaxmples are enough.

　　五、列举特征式论证法

　　指出某事物发生或者生存的征候或者迹象。例如:

　　论点:The child has chickenpox.

　　论据:The child has red spots.

　　推理依据:These spots are signs of chickenpox.

　　六、类比论证法

　　用我们已知的、熟悉的事物同未知的。不熟悉的事物加以比较，并用前者的情况解释者 的情况。分为三种:纵向类比、横向类比、比喻式类比。例如:

　　1.纵向类比

　　论点:Many people will die of SARS.

　　论据:Many people died of the Black Death.

　　推理依据:SARS and Black Death are similar.

　　2.横向类比

　　论点:China should have its fighter carriers.

　　论据:A neighboring country has a powerful carrier fleet.

　　推理依据:The two countries are similar enough to draw such a comparison.

　　3.比喻式类比

　　论点:Reading a difficult book should take time.

　　论据:Digesting a large metal takes time.

　　推理依据:Reading and eating are sufficiently alike to be compared.

　　七、引用权威论证法

　　引用公认的权威，或者论证自己就是权威从而对自己的观点加以论证。例如:

　　论点:Chinas economy will grow 8 poercent this year.

　　论据:Professors and scientists say so.

　　推理依据:These experts are reliable.

　　八、诉诸尝试法

　　利用人们的常识【包括:普遍的价值观念、人的普遍动机、生活常识】进行论证。例如:

　　1.诉诸普遍性的价值观念。

　　论点:The university curriculum should be multicultural.

　　论据:A multicultural curriculum will contribute to equality and acceptance.

　　推理依据:You value equality and acceptance.

　　2.诉诸普遍动机

　　论点:You should support this candidate premier.

　　论据:The candidate can help you get job security and safe neighbourhoods.

　　推理依据:You want job security and safe neighbourhoods.

　　3.诉诸生活常识

　　论点:She was very kind to me.

　　论据:She treated me with the best tea she had.

　　推理依据:A treatment with the best tea is an expression of kindness.

　　九、反证法

　　假设一个观点是正确的，然后却推导出荒谬的结论。例如:

　　论点:An industrious man must also be thrifty.

　　论据:With only industry but without thrift ，the person will end uo bankrupt.

　　推理依据:An industrious person ending up bankrupt sounds absurd.

　　十、统计数据论证法

　　提供数据，以资论证。例如:

　　论点:We should end the current poverty-relief program.

　　论据:It costs $45 million per year.

　　推理依据:This is too much;it proves we should end it.

　　只是一个详细的结构上的分析说明，在具体运用时，我们经常讲推理依据和论据放在了一起，但只要合理即可。论据可以自己编造，也可以是大众的例子，关键在于自己怎么样建立论点和论据之间的桥梁。上面的这些技巧，可能我们只用到某种或某几种，但我们必须得会至少一种。