单项选择题

Radio signals are waves that are used to _________ music or speech.

A．transfer
B．transmit
C．transport
D．transform
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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
单项选择题
The Indians' chief purp0se in writing the letter seems to be to _________.
A．politely refuse a friendly offer
B．express their opinions on equal treatment
C．show their pride
D．describe Indian customs
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