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.
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A．The protection of prisoners of war. B．The prevention of the outbreak of a war. C．The signing of Geneva Convention. D．The popularity of first aid knowledge.
A．The protection of prisoners of war.
B．The prevention of the outbreak of a war.
C．The signing of Geneva Convention.
D．The popularity of first aid knowledge.
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A．Tokyo in Japan. B．Beijing in China. C．Shanghai in China. D．Seoul in South Korea.
A．Tokyo in Japan.
B．Beijing in China.
C．Shanghai in China.
D．Seoul in South Korea.
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