Task 1 饼图 The pie charts show the proportion of the energy produced from different sources in a country between 1985 and 2003. Summarise the information by selecting and reporting the main features and make comparisons where relevant. 分析: 动态饼图,主要突出不同构成部分的比例变化,但与此同时也要去分析同部分的排序变化。最后要注意表示比例的一些常见用法。