从方框中选择最佳选项完成对话，其中有两项是多余的

A. Is that your eraser? B. Yes, it is. It's mine. C. Excuse me. D. No, they aren't. E. Thank you for your help. F. How do you spell it? G. What are these?

  A:  What's this in English?

  B: It's an eraser.

  A:

  B: E-R-A-S-E-R.

  A:  

  B: No, it isn't.

  A: What about this pencil?

  B:

  A: Here you are.

  B: 

  A: You're welcome.