单项选择题

When fire breaks out in a tunnel, the most important thing is to ______.

A．install a Rogogat quickly
B．detect the smoke quickly
C．change the ventilation
D．take quick actions
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单项选择题
The Robogat is designed to pump water ______.
A．at a speed of 500 liters a minute
B．almost as fast as an airport tender
C．six times faster than an ordinary fire-engine
D．at a rate of an airport fire tender
单项选择题
This passage suggests that a well-organized family is a family whose members ______.
A．are not psychologically withdrawn from one another
B．seldom quarrel with each other even when they disagree
C．often help each other with true love and affection
D．are exposed to the same new ideas introduced by books, radios and TV sets
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