M: Now, this is Westminster Abbey. It's one of the oldest buildings in London and in its architecture, you will recognize different styles. ,F: Wow, it's really splendid. ,M: There, to the left, you will see a small Street called Downing Street No.10, the last of its 10 houses has always been the living place of the British Prime Minister. ,F: Oh, is that the Tower Bridge? ,M: Yeah, look, the bridges parting in the middle and the two halves are moving upwards, a big ship is passing underneath.
(A) F: Why is the Tower Bridge moving down? (B) F: Oh, it is holding back a ship. Why doesn't it give way? (C) F: It is giving way to a small ship. (D) F: I didn’t hear you. Please could you tell me again?
D