数据图：【饼图】
主要描述：【比较】。注意：比较关系存在于每个饼内部的板块，也存在于饼之间。
Introduction
Shown in the set of three pies are the average percentages of three substances consumed in Americans’ meals. in general, there are apparent similarities and notable differences.
开头段落中的第 一句话的划线部分是老章反复提及的倒装现象。
开头段落中的第二句话，既是对图表的总述，也是套话，还有词汇得分点(表示程度的形容词)。
Body
老章强烈建议，在展开主体部分的写作之前，对图表中的信息进行分组：找到异同。一般说来，相同或相似在一组。然后，去对比于不同的一组。
First, the similarity between the intake of sodium and that of saturated fat is marked: in dinner, American people take in the largest portion (43% and 37% respectively) of a day’s whole amount of the two nutrients they consume. The second highest daily intake of sodium (29%) happens in lunch and is twice of the intake when Americans eat breakfast or snacks. Third, in terms of the consumption of saturated fat, there are no wide variations but a 5% difference between the meals except dinner.
The case with added sugar is vastly different. 42% – a predominating percentage – of added sugar is taken in during eating snacks, making a sharp contrast with the 16%-23% during the three regular meals.
最后这个段落，两句话。第 一句话是用第三个饼去比较于前两个饼。第二句话是第三个饼内部的比较。
Conclusion
Overall, since those substances may cause health problems if eaten in excessive amounts, Americans should be most careful when they eat dinner and snacks.
这个结尾段落的写作内容有一些难度。难点在于超越了数字，去解读数据暗示的信息(但是注意，这个解读是安全的，是基于题目中的“all of which may be unhealthy if eaten too much”而来的)。
