单项选择题

A．$12.
B．$15.
C．$25.
D．$2.5.
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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.
单项选择题
A．Taking the key from the guard secretly.B．Killing the guard to take the key.C．Waking the guard up to ask for his help.D．Stealing the gun from the guard.
A．Taking the key from the guard secretly.
B．Killing the guard to take the key.
C．Waking the guard up to ask for his help.
D．Stealing the gun from the guard.
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