图表种类 Line graph 图表内容 The graph shows sales for books of three categories in the UK between 2002 and 2006.Summarize the information by selecting and reporting the main features, and make comparisons where relevant. 图表要素回忆adult fiction, educational books, children’s book这三种书从2002年到2006年的销量对比($million)，其中children’s book是连续四年保持销量增长，adult fiction和educational books是彼此相反，一个上升另一个就下降。