从方框中选择恰当的句子补全对话
A: Where are you going, Tony?
B: The library. I want to borrow some books.
A:   
B: About inventions. You know I have to prepare for the science lesson.
A:      And we humans are really great.
B: That’s true. People have made lots of inventions.
A:      
B: Sorry, I’m not sure.     
A: I don’t agree. In my opinion, cars are the mostuseful.
B:    
A: Because I can go anywhere quickly and conveniently in my car.

A.Maybe light bulbs(灯泡) are the most useful inventions. V.What kind of book do you want to borrow? C.Great inventions have changed the world a lot. D.Why do you think so? E.What do you think the most useful invention is?