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
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单项选择题
According to this passage, nobody knows for sure _________.
A．how people began to use fire
B．why people began to use fire
C．how to make a fire with matches
单项选择题
Fires kill _________ every year.
A．a lot of people
B．few people
C．only some babies
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