根据对话内容，从方框内选出能填入空白处的最佳选项，其中有两项为多余选项。

A: Look at that strange thing, Wei Hua! What’s that?

B: It’s a key.  小题1:           

A: Our autobike (电动自行车)?  小题2: 

B: It was invented by my father. It’s a battery-operated（电池驱动的）machine.

A:   小题3: 

B: It’s used for riding or flying.

A: Flying? __小题4:____

B: You can just ride it like a autobike and it will fly as it goes faster enough.

A: ___小题5:___ I think your father is so great!

B: I think so. He has invented many things.

下列不属于高压部件的是

A．高压变压器
B．高压接触器
C．高压交换闸
D．灯丝变压器
E．高压电缆