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第八单元 推展段落方法之一事实与数据法 在第四单元，我们曾提到推展段落的方法有多种。从这一单元开始，我们将逐个介绍这些方法。 8.1事实与数据法 事实(a fact)是可以客观证实的事情。例如：The sunrises in the east.是个事实。Oil and water do not mix.也是个事实。两者都可以通过实验证明是真实的。但是Eating carrots improves eyesight.也许是真实也许是不真实的。这不是个事实，是一种看法(opinion)。数据(a statistic)是一个数字事实(a numeral fact)，用于给某一主题提供有意义的信息。例如： There are twenty-five students in the class.是一个数据。 示范段落8-1 The term population explosion is usually applied to the rapid growth of population over the last three centuries.In the two hundred years from 1650 to 1850，world population doubled and reached its first billion.In the next eighty years，it doubled again，and by 1975，it had doubled once more to a total of 4 billion.By the year 2000，it is estimated that it will exceed 6 billion and possibly approach 7 billion unless there is a major reduction in birth rates or amajor increase in death rates. 8.2示范段落分析 主题句：The term population explosion is usually applied to the rapid growth of population over the last three centuries. | 
