单项选择题

The old couple has been living an _________ life. They have saved up a large sum of money.

A．economy
B．economic
C．economics
D．economical
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单项选择题
Radio signals are waves that are used to _________ music or speech.
A．transfer
B．transmit
C．transport
D．transform
单项选择题
Could you give me a rough _________ of what the job might cost
A．estimate
B．detail
C．account
D．value
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