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．Practical experience and ability.B．Years of patient practice.C．A piece of paper.D．A set of instructions.
A．Practical experience and ability.
B．Years of patient practice.
C．A piece of paper.
D．A set of instructions.
单项选择题
A．He was about 24 years old.B．He was a talented mechanical engineer.C．He was always ready to accept advice and criticism from other people.D．He was strong-minded.
A．He was about 24 years old.
B．He was a talented mechanical engineer.
C．He was always ready to accept advice and criticism from other people.
D．He was strong-minded.
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