单项选择题

The Robogat can quickly get through to the scene of a fire because ______.

A．it is in position in the middle of the tunnel
B．it can move on a monorail suspended from the roof of the tunnel
C．it runs on a monorail and can take quick action
D．its modified water main can run along the tunnel quickly
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单项选择题
One problem that has not yet been solved, it seems, is that ______.
A．a prototype has not yet been accepted
B．financial backing is not available
C．the machine will need fire-resistant sensors
D．the machine would not work if the ventilation was overwhelmed
单项选择题
According to the passage, because temperatures in a tunnel can be very high, ______.
A．the Robogat has to have a heat-resistant skin
B．the Robogat is operated in a control centre outside the tunnel
C．the Robogat can only work at the scene of a fire for a limited period
D．a Robogat is stationed at each end
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