单项选择题

Fires die _________.

A． without water
B． without air
C． with oxygen
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单项选择题
We need fire because it helps us _________.
A． kill animals and burn forest
B． warm house, cook food and so on
C． build bridges
单项选择题
A small fire _________.
A． is caused by a big fire
B． can become a big fire very fast
C． can never become a big fire
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