A. The plane is full.

B. The plane is late.

C. The plane has broken down.

D. The flight is canceled.

18.

A. All rooms are taken.

B. Many spare rooms are available.

C. There are only double rooms.

D. There is just a single room.

17.

W: Sorry, sir. The flight is somewhat behind schedule.

M: Thank you. You will tell us as soon as you know something definite,won't you?

Q: What can we learn from the conversation?

正确答案：B

解析：女士说飞机晚点了，故B正确。late即behind schedule的同义表达。

18.

M: I sent a letter to make a reservation for a single room a few days ago.

W: I'm sorry, but your request arrived too late. There are some conferences in town this week and we're full up.

Q: Why couldn't the man book a room as he wished?

正确答案：A

解析：女士回答说，因为这个星期城里有些会议，所以房间都订满了。故A正确。据full up（是订房场景的常用关键词）可作答。