单项选择题

The computer system can help firefighters by giving medical information about ______ living in a burning building.

A．dwellers
B．residents
C．clients
D．invalids
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单项选择题
This is a new model of ______ typewriter especially designed to meet the needs of traveling businessmen.
A．flexible
B．mobile
C．portable
D．active
单项选择题
When the ______ is complete it will be at least two weeks before you receive your copy of the contract.
A．transition
B．transaction
C．transformation
D．transplantation
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