题目内容：

补全对话（有两项多余）。

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

B: It’s a key. 1.

A: Auto-bike? What’s it then? 2.

B: It’s a battery-operated machine and it was invented by my father!

A: 3.

B: It’s used for riding or flying.

A: Flying? 4.

B: You can just ride it like an auto-bike and it will fly as it goes fast enough.

A: 5. I think your father is so great!

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

A. What’s it used for?

B. That sounds interesting.

C. It’s very useful.

D. How can it fly?

E. Who invented it?

F. How was it invented?

G. It’s used for opening and locking our auto-bike.