单项选择题

A．An opening speech of a lecture.
B．The text of the economist’s speech.
C．A discussion on inflation and investment.
D．The interpretation of the phrase "economic depression".
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单项选择题
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.
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.
单项选择题
A．A bomb threat at a hospital.B．A flood at a school.C．A fire at an apartment building.D．A traffic accident near a building.
A．A bomb threat at a hospital.
B．A flood at a school.
C．A fire at an apartment building.
D．A traffic accident near a building.
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