—Excuse me. Could you help me carry the heavy box?

—_______.[ ]

A. Yes, I could.

B. It doesn't matter.

C. With pleasure.

D. Don't mention it.

如果暖风机开关开到哪一挡电机都不能转，检查开关处，如果没电，可能是（）。

A.电机坏

B.开关坏

C.保险熔断

D.搭铁不良