1) 根据各组对话内容，从下面方框中提供的5个选项中选出能填入空白处的最佳选项。

A: Would you sign the register please, SirB: Sure.() ,does my morn have a private bathA: Certainly. Every room in this hotel has a private bath.

A. Thank you

B. It’s my pleasure

C. By the way

D. No, of course not

E. Never mind

锅炉给水调节的任务是维持锅炉汽包水位在允许的范围内，使得锅炉的给水量适应锅炉的燃烧量。