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
Research shows that pupils who are good at math tend to be more conformist and （） than other pupils.

A．obscure
B．obvious
C．obedient
D．objective
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