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【答案】⑴B;⑵A;⑶A
【解析】
⑴A: Wow! There're a lot of public signs here.
B: Yes. They mean different things. Look, the one on the grass means “Keep off the grass”.
⑵A: Hello!What does this sign mean?
B: Which one?
A: The one on the wall.
B: It means we must stay away from here.
⑶A: Look,there is a sign on the wall. What does it mean?
B: It means we shouldn't smoke here.
A: Oh,I see. Thank you.