单项选择题

A．When the plane is in danger.
B．During test flights in the air.
C．When all the engines suddenly go wrong.
D．During test flights in the lab.
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单项选择题
A．Warm-hearted but careless.B．Curious and mischievous.C．Helpful and tricky.D．Prudent but cautious.
A．Warm-hearted but careless.
B．Curious and mischievous.
C．Helpful and tricky.
D．Prudent but cautious.
单项选择题
A．Because there would be less damage when the plane explodes under water,B．Because the pressure of water is always smaller than that of air.C．Because this is the only way to find out which part has cracked.D．Because some parts of a plane are more likely to crack in water than in the air.
A．Because there would be less damage when the plane explodes under water,
B．Because the pressure of water is always smaller than that of air.
C．Because this is the only way to find out which part has cracked.
D．Because some parts of a plane are more likely to crack in water than in the air.
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