单项选择题

They were ______ in their scientific research, not knowing what happened just outside their lab.

A．impaired
B．immersed
C．ignited
D．induced
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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
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
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