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
Scientists are beginning to understand that men are different from animals because ________.
A．they can think and learn
B．they can speak
C．they can use computers
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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