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．By barking in order to attract people’s attention.B．By pulling the baby to safety.C．By comforting the baby until help came.D．By protecting the baby against the fire.
A．By barking in order to attract people’s attention.
B．By pulling the baby to safety.
C．By comforting the baby until help came.
D．By protecting the baby against the fire.
单项选择题
A．A platform worker.B．The command spot.C．A computer.D．A machine.
A．A platform worker.
B．The command spot.
C．A computer.
D．A machine.
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