14.聽第10段材料,回答第17至20題.
17.Why does the speaker give the talk?
A.To announce some changes
B.To apologize for an accident
C.To inform passengers of leaving
18.From which platform will the train to London leave?
A.3 B.6 C.9
19.When will the train to Bristol leave?
A.At 10:15 am B.At 10:55 am C.At 12:20 pm
20.What can we learn about Mr.Green?
A.He is travelling to London
B.He works in the luggage office
C.He lost his computer at the railway station.