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 can give ______.
A．all useful and useless information about the city
B．valuable information about every resident in that city
C．useful information about every street address in the city
D．lively description about each building on fire
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