听力原文：

G: Jeff, how should we go to the airport?

B: I think we can take a bus to go there.

G: The traffic is very heavy now. If we do, we’ll be late for the plane.

B: Let’s go by taxi, shall we? 

G: If we take a taxi, it’ll be too expensive, and at this time taxis can’t be faster than buses.

B: What do you think we should do?

G: What about taking the subway?

B: I think that’s a great idea! The subway is fast and doesn’t get stuck in traffic.

G: Let’s go!

参考答案：4. A 5. C