段落基本句型构造
1 概述现象段
概述现象段通常出现在说明现象类作文的第一段，其基本的句型构造是：先用一句话概括现象的总体情况，这是段落的主题句；然后具体描述现象的突出表现或具体变化，以支持主题句。
例
Directions:For this part，you are allowed 30 minutes to write an essay entitled Digital Age.You should write at least 120 words following the outline given below in Chinese:
1.如今数字化产品得到了越来越广泛的使用，举例说明。
2.数字化产品的使用对人们工作、学习和生活产生的影响。
第一段：概述现象段
①Nowadays，digital products are extremely popular and play a very critical role in modern society.②Taking a look around，you can find too numerous examples to mention individually，and the best one may be the computers.③In addition，other digital products，like digital camera，digital TVs，etc.，have gradually become indispensable parts of our life.
2 描写图表段(https://www.daowen.com)
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
①As is indicated in the above graph，the rate of car accidents in Walton City rises and falls with the change of months.②From 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 by 50%.③However，from then on，the curve descends all the way to the lowest point，16 to be exact.