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
They were ______ in their scientific research, not knowing what happened just outside their lab.
A．impaired
B．immersed
C．ignited
D．induced
单项选择题
There are several theories as to why the dinosaurs become ______.
A．extinct
B．credible
C．distinct
D．esthetic
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