图表类型

线图（动态图）

作文题目

Eating sweet foods produces acid in the  mouth, which can cause tooth decay. (High acid levels are measured by low pH  values)

Describe the information below and discuss  the implications for dental health.

图片

思路

Anyone who has visited a dentist has been told that eating  excessive amounts of sweets risks harming the teeth. This is because sweets  lower pH levels in the mouth to dangerous levels.

When the pH level in the mouth is kept above 5.5, acidity is  such that teeth are unlikely to be in danger of decay. Sweet foods, however,  cause pH in the mouth to drop for a time, and the longer pH levels remain  below 5.5, the greater the opportunity for decay to occur.

By comparing fruit sugar, cane sugar and honey, which are all  common ingredients of sweet foods, we find that cane sugar lowers pH levels  for the longest period, thus producing the greatest risk of the three.  Approximately five minutes after consuming cane sugar, pH levels drop to as  little as pH 3.5. They then begin to rise slowly, but do not rise above pH  5.5 until at least 30 minutes have elapsed. By contrast, fruit sugar, which  causes the mouth's acidity to fall to just above pH 4, poses a danger for a  shorter period: tooth decay is unlikely 20 minutes after consumption. Honey  appears an even less risky substance. Though acidity falls to about pH 4.75  within five minutes of consumption, it returns to above pH 5.5 in under fifteen  minutes.

The implications, then, are that people who insist on eating  sweet foods should be aware of the ingredients, and that fruit sugar or honey  appears preferable to cane sugar.

类似旧题

The graph below shows the  proportion of the population aged 65 and over between 1940 and 2040 in three different countries.

作文题目

Some people think that the amount of  noise people make should be controlled strictly while others say that people  are free to make as much noise as they wish. Discuss both views and give your  opinion.

题型/题材

Argumentation（讨论双边观点）+社会类

类似旧题

Some people think government should ban  dangerous sports, while others think it is people's freedom to do whatever  sports activities they choose. Discuss both views and give your opinion. (11.07.30)

Some believe governments should do more  to make citizens have a healthy diet, while others believe individuals should  attach importance to their own diets and health. Discuss both views and give  your opinion(140719)

Some people think government should ban  dangerous sports and some others think it is a freedom to choose the  activities we want to. Discuss both view and give your opinion.(140809)

写作思路

开头段：

在很多国家噪音污染和水污染食品污染一样越来越严重，这个问题给人们造成很大的困扰。有人建议应该严格控制噪音，但有的人认为制造多大的声音是个人自由。

主体段一：

1、  噪音降低工作和学习的效率。噪音是人心烦意乱不能够专注自己的事情而且使人烦躁焦虑不能够冷静思考问题。此外，噪音会让人失眠，第二天不能够精力充沛地工作，这也会降低工作效率。

2、  噪音是人类健康的头号杀手。噪音往往导致失眠，长时间低质量睡眠对青少年人的发育和成长有害，而成人长期缺乏睡眠会导致精神恍惚在工作和生活中更容易发生一些意外的事故而且会产生一些精神问题。

主体段二：

1、  有些时候个人制造噪音是不可避免的。深夜轰鸣的货车，火车以及飞机是发展的需要，建筑工地施工的噪音也是。家庭举办聚会是为了联络家人朋友之间的感情也是必不可少的。如果限制的话，对个人和社会发展都会不利。

主体段三：

噪音对人的健康有害，所以政府必须要严格控制。

政府要让民众了解噪音带来的危害，教育民众行使自己的权利不应以伤害别人为代价。

此外，在公共场所限制声音的最高分贝；在非公共场所也要限制可以制造噪音的时间，在科学的睡眠时间段限制噪音的音量。