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.
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单项选择题
A．People in developing countries. B．People in Asian countries. C．People in European countries. D．People in developed countries.
A．People in developing countries.
B．People in Asian countries.
C．People in European countries.
D．People in developed countries.
单项选择题
A．Before finishing school. B．After finishing university. C．During her university course. D．Between high school and university.
A．Before finishing school.
B．After finishing university.
C．During her university course.
D．Between high school and university.
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