情境交际

A:Can you name three of them?

B:I think they are computers. telephones and light bulbs.

A:

B: I think the light bulb is the most useful one.

A:

B: Because the light bulb gives people more time to work and play every day.

A:

B: The computer is the most useful invention too. .

A: Which is more useful?

B: Er...

A. Let me see. B. What about the computer? C. What invention do you think is more important? D. Why do you think so? E. What do you think is the most useful invention? F. How do you like it? G. Some important inventions have changed the world.