单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．It is appropriate.
B．It is too informal.
C．It is normal.
D．It is too formal.
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单项选择题
A．Detect the smoke quickly.B．Take quick action.C．Close the tunnel.D．Install a Robogat.
A．Detect the smoke quickly.
B．Take quick action.
C．Close the tunnel.
D．Install a Robogat.
填空题
C
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