单项选择题

What is Pamela’s job

A．She is a clerk in travel agency.
B．She is a publisher.
C．She is a kindergarten teacher.
D．She is an editor.
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单项选择题
If no signal is sent from the command spot, what will happen to the train
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.
单项选择题
What happened to the London underground railway about three decades ago
A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Its trains became computer-controlled.
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