根据下面对话的意思，选择合适的选项补全对话，将序号写在横线上。

Jack: Hello!

Hans: Hello. This is Hans. May I speak to Jack, please?

Jack: 1___________.

Hans: Hi, Jack. How are you?

Jack: Fine, thanks. How are you?

Hans: I'm fine. Thank you. Jack, 2___________

Jack: Sure. 3___________.

Hans: There is something wrong with my computer. Can you repair it?

Jack: Certainly, but not today. 4___________.

Hans: OK. Thanks a lot. 5___________.

A. See you then.

B. What is it?

C. How about Sunday afternoon?

D. Can you help me?

E. Speaking.

加快发展黄河三角洲高效生态经济，不仅关系到环渤海地区整体实力的提升和区域协调发展的全局，也关系到环渤海和黄河下游生态环境的保护。这表明

① 事物是普遍联系的，要用联系的观点看问题 

②事务是变化发展的，要用发展的观点看问题 

③整体与部分是相互联系、相互影响、相互促进的 

④量变与质变是辩证统一的

A．①②④

B．②③④

C．①②③

D．①③④