下图所示的微观变化，其基本反应类型是（）

椭圆$\left\{\begin{array}{c}x=4os\theta \\ y=5\sin \theta \end{array}\right.$（θ为参数）的长轴长为（　　）

根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
Mrs. Lee: Hello. 68178502.
David:  Hello.____  ?
Mrs. Lee: Sorry.____ . Can I take a message?
David:  Yes. This is David, Bruce’s friend. I want to ask him for some Chinese ancient coins. He told me he had got some recently. ____  . I don’t care if they were made of different metals. I just want to add some more coins in my collection.
Mrs. Lee: OK. I’ll tell him. Would you like him to ring you back later?
David:  Well, I won’t be at home later this day. Would you please ask him to ring me tomorrow morning?
Mrs. Lee: Sure.____ ?
David:   Oh, sorry.____   The new number is 66129853.
Mrs. Lee: OK. I’ll write a message for him.
David:   It’s really nice of you, Madam. Thank you very much. Goodbye!
Mrs. Lee:  Bye!

中国在新工业化发展过程中，开发可再生能源以缓解石油短缺引起的能源危机是一个重要的课题.2003年元月份，某省投资建设一个年生产工业酒精500万吨的工厂，目的是为了将工业酒精与汽油混合作为汽车燃料而减少汽油的消耗量．已知制酒精的方法有三种：

方法一：CH₂=CH₂+H₂OCH₃CH₂OH

方法二：CH₃﹣CH₂Br+H₂OCH₃CH₂OH+HBr

方法三：（C₆H₁₀O₅）n（淀粉）+n H₂O  n C₆H₁₂O₆（葡萄糖）

C₆H₁₂O₆（葡萄糖） 2C₂H₅OH+2CO₂↑