单项选择题

Scientists once thought that men are different from animals because ________.

A．they can think and learn
B．they can make tools
C．they can speak
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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
Man can speak because ________.
A．he has a brain
B．he has a head
C．he has a mouth
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