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
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
单项选择题
According to the passage, man has built the modern world because ________.
A． he is very clever
B． he has language
C． he has computers
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