单项选择题

A．It is in a critical but stable condition.
B．It is in serious condition.
C．It is in good condition.
D．It is dead.
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单项选择题
A．It will stop automatically.B．It will move on at the same speed.C．It will gradually slow down.D．It will keep a safe distance from the other trains.
A．It will stop automatically.
B．It will move on at the same speed.
C．It will gradually slow down.
D．It will keep a safe distance from the other trains.
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