单项选择题

A．A platform worker.
B．The command spot.
C．A computer.
D．A machine.
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单项选择题
A．In the morning.B．In the early afternoon.C．In the evening.D．At midnight.
A．In the morning.
B．In the early afternoon.
C．In the evening.
D．At midnight.
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.
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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