W: Excuse me, sir. May I have a word with you? M: Sure. What can I do for you? W: It’s about the slippery floor. People will fall and get injured. M: You’re right. I’ll put a warning sign after mopping the floor. 23. The dialogue is about ______.
A.
safety
B.
friendship
C.
weather
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【单选题】It is amazing that the little boy can swim ________the river ________100 meters in width.