二、描写图表段
　　描写图表段通常出现在图表阐释类作文的第一段，其基本的句型构造是：先用一句话概括图表所反映的总体现象、变化或问题，这是段落的主题句；然后用2-3句话具体描述图表中数据的对比或变化情况，以支持主题句。

　　例
　　Directions : For this part , you are allowed 30 minutes to write a composition based on the graph below . The suggested title is : Car Accidents Declining in Walton City . Remember that your composition must be written according to the following outline :
　　1.描述图表中反映的车祸发生率的变化。
　　2.分析该市车祸发生率下降的原因。
　　3.你对该市今年车祸发生率走势的预测。

　　第一段：描写图表段
　　(1) As is indicated in the above graph , the rate of car accidents in Walton City rises and falls with the change of months . (2) From January to March , the number of car accidents rises from 22 to 32 , and then drops to 26 in the next three months . After that , it climbs up again to 39 , increasing hy 50% . (3) However , from then on , the curve descends all the way to the lowest point , 16 to be exact .