2)有两种情况其一是在不同时间段内的数据比较，另外是单独数据的全程描述。前者适合于数据代表的物体较少且时间界限明确的情况下，后者适合于描述数据对象很多且时间划定不清晰。当然依据考试中的题目来决定。
语言点：1)变化状态幅度词(要依据描述的情况决定)
轻微—–slightly, slowly(速度), steadily(平缓)逐渐—-gradually
显著—–significantly , markedly急剧—–rapidly , dramatically , abruptly ,sharply突然—suddenly趋势—trend inclination tendacy
2)变量幅度词语
★增加—–increase, jump ,go up ,rise, climb , ascend , level up ,surge,
★减少—-decrease, drop ,go down ,fall,—- , descend, level down ,
★水平—-keep/stay/remain/maintain stable ,—-steady ,be similar to ,there is little/hardly any/no change
★最高—–reach a highest point/the top/the summit/the peak/the most/peak in,at
★最低—–reach a lowest point/the bottom//rock/hit a trough /bottom out
★交叉—–correspond with in —-year; — crossing the line for —–
3)时间幅度词语
During the period 1970—1999 ; From 1970 to 1999 ; Since the early 1970s ;
In 1970——then in 1980—–ten years later
4)基本句型
There was变化趋势in the number of A from 1986-1990(over next…..yeas) ,which was followed by变化趋势and then变化趋势until 1998 when there was变化趋势for the next….years
From 1990 onwards, there was变化趋势in the number of A which then变化趋势at $% in 1994.
In 1990,the number reached (was) $%,but 30 years later there was变化趋势.
After变化趋势from…to…,A begin变化趋势over the next….years.
The number of…increased rapidly from 1988 to 1990 during the five-year period
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There was a rapid increase from 1988 to 1990 during the five-year period
A has almost/nearly/about/over a quarter/half/twice/one third /as many students as/as much money as /B; A has about/approximately/exactly/precisely the same number/proportion/amount of students/money as…..
It has reached something of a plateau,X percent/an average of X percent in the past few years in 1998.
in the 3 years spanning from 1995 through 1998……
the percentage of……is sightly larger/smaller than that of……..
the graphs show a threefold increase in the number of.
…….decreased year by year while……increased steadily…….
here is an upward trend in the number of
..(year)witnessed/saw a sharp rise in……..
a has something in common with b/ the difference between a and b lies in..
柱状图(Bar chart)
注意点：1)柱图主要是陈列的数据比较多，不能将所有的信息写出，只能抓住重点与关键点来写(这些点可以是最大、小值；最高、低值；差距最大最小点等等)都需要结合题目来分析，对于一些点的特征具有相似性应该采用统一合并的方法，不能每有项都列出。
2)应该根据一定的顺序来写，否则会因逻辑不合理而失分
语言点：1)一般是以比较极与最高级的句子形式出现如
Low income consumed more hamburghers than other group(=more than other /group/ on hamburghers),spending more than twice/ as much as hamburghers than FC and Pizza(both about 40%)liuxuepaper.com