单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．Health care.
B．Housing problem.
C．Transportation problem.
D．Educational problem.
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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.
填空题
F)。
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