题目

It was the last figure skating competition for this season. Our team must beat every other team to enter the state competition. Skaters were practicing all over the ice. Suddenly my teammate Danielle knocked her head hard on the ice and cried loudly, then she was carried out of the rink (冰场) and sent to hospital. “Allison,” Coach Janice came up to me, “Danielle can’t _______ today. So I need you to do the axel（前外一周半跳）.” “Coach,” I couldn’t even think of words, “I only _______ it for the first time three weeks ago! ”“I know, but you’re the only one b如图是8种有机化合物的转换关系：请回答下列问题：（1）根据系统命名法，化合物A的名称是 ．（2）上述框图中，①是 反应，③是 反应（填反应类型）．（3）化合物E是重要的工业原料，写出由D生成E的化学方程式： ．（4）C1的结构简式是 ；F1的结构简式是 ．F1与F2的关系为 ．