单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．Detect the smoke quickly.
B．Take quick action.
C．Close the tunnel.
D．Install a Robogat.

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danger→dangers

Passage ThreeQuestions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。