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?
正確答案：B
解析：女士說飛機晚點了，故B正確。late即behind schedule的同義表達。

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?
正確答案：A
解析：女士回答說，因為這個星期城里有些會議，所以房間都訂滿了。故A正確。據full up（是訂房場景的常用關鍵詞）可作答。