写作时段落的扩展—因果法
如何写作。
合理的段落展开方法能把中心思想和材料有机地组织起来，让读者在阅读过程中感到很强的条理性。下面主要介绍四种英文段落的扩展方法：
因果法
因果法可以有效地说明两个事物或两种现象之间的关系。段落的主题句一般都明确地指出段落所要阐述的是造成某一现象的原因，还是某一现象将引起的后果。以Changes of Ownership of Houses in China(2003.6 & CET-6)一文的第2-3段为例：
Two main reasons may account for this situation. One of the reasons is the policy of the government. In the 1990s, the government carried on with its reform policy to support private houses programs. But it took time for the reform to come into effect. Therefore, in this period the change is little. Another reason is that from 1995 on the reformation took quicker steps, and people were getting better off and they could afford buying their own houses. So the number of private houses is on the rise.
However, such changes have had great impacts on individuals and the society as well. To the former, the change has enabled them to have more choices to enjoy larger living space, but the cost is working hard to make more money to buy it. To the latter, the more choice of housing may mean a big gap between the rich and the poor, and also some other social problems like speculating will occur. Therefore, it is hard to weigh the merits and demerits of these changes.
