学进去

根据对话内容，从所给的七个选项中选出最佳选项。每个选项只能选用1次，其中有两项为多余选项。
A: Hi, Jacky. Look at that strange thing! What is it?
B: Hi, Lucy. Oh, it’s a key. 1．
A: Auto-bike? What is an auto-bike then?
B: It is a battery-operated(电动的) machine.
A: 2．
B: It was invented by my grandfather!
A: Really? 3．
B: It can be used for riding and flying.
A: Flying? 4．
B: You can just ride it like a bike and it will fly as it goes fast enough.
A: 5． I think your grandfather is so great!
B: I think so. He has invented many things.

A．And what is it used for?

B．It’s used for locking our auto-bike.

C．Can you tell me who invented it?

D．It’s very important.

E．Oh, how can it fly?

F．It sounds interesting.

G．How was it invented?