71. Where is this announcement most likely being made?
(A) At an airport
(B) At a train station
(C) At a bus terminal
(D) At a ferry port

Questions 71 through 73 refer to the following announcement. 

May I have your attention, please? This is an announcement for passengers waiting for the Express Train 509 to Central City. Due to a signal malfunction near the North Bridge, the train will be arriving approximately 15 minutes late. Consequently, the boarding platform has been changed. The train will now be arriving at platform 4 instead of platform 2. We apologize for the inconvenience. Passengers requiring assistance with their luggage, please use the elevators located at the end of the concourse.

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第 71 至 73 題與以下公告相關。

請各位乘客注意。這是一則為候車前往中央城的 509 次特快列車準備的公告。由於北橋附近信號故障，列車將晚點約 15 分鐘到達。因此，列車停靠的月台已變更。列車將停靠 4 號月台，而非原定的 2 號月台。由此造成您的不便，敬請諒解。需要搬運行李的乘客，請使用位於候車大廳盡頭的電梯。