相信大部分同学都已经熟悉了DI的答题结构：

　　1. Introduction 介绍图片

　　2. General Trend 说明趋势

　　3. Detail 1 列举细节1

　　4. Detail 2 列举细节2

　　5. Conclusion 给出总结

　　这道题的难点就是如何理解图片的含义，从而去寻找合理的细节。下面我们会附上Jeffrey老师给的两个分数档次的参考答案，大家一定要可以对比学习一下哦~

　　79分参考答案：

　　This diagram illustrates the idea of dendrochronology, also known as the scientific study of tree rings. In general, the colour and width of the tree rings can represent the change in climate conditions. To be more specific, warm weather is more suitable for the nurturing of plants and therefore produces wider rings with relatively light colours. In contrast, trees do not grow fast in cold weather and the rings produced are hence tighter and dark in colour. In conclusion, dendrochronology is useful for determining the timing of events and rates of change in the environment.

　　65分参考答案：

　　This is a picture about the tree rings. Tree rings tells us the age of a tree and what happened at a particular period of time. Overall, we can see that there are two different patterns in the tree rings. To be more specific, we can see the impact of a warmer climate at the centre of the tree rings. In addition, we can also see the impact of a cooler climate. Therefore, we can find evidence of the climate change in the growth of tree rings.

　　Key Vocabulary

　　☑ illustrate v. 描绘，阐明

　　☑ dendrochronology n. 树木年代学

　　☑ climate condition 气候条件

　　☑ nurture v.养育，滋养

　　☑ relatively adv. 相对的

　　☑ In contrast 相反

　　☑ pattern n. 模式，图案

　　☑ tree ring 年轮