单项选择题

A．The persons with fixed incomes.
B．The persons with slow-rising incomes.
C．The elderly who depend upon pensions.
D．The employee with a salary agreed on in a short-term contract.
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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.
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