单项选择题
"Invalid" means a person who ______.
A．is badly burned or injured
B．is trapped by fire
C．has become very weak through illness or injury
D．is helped out by fire-fighters
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单项选择题
The computer center can ______.
A．give the firemen important help in almost every way
B．have limited ways of helping fire-fighters
C．hardly give any useful information for the fire brigade
D．put out every fire automatically
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