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
Man can speak because ________.
A．he has a brain
B．he has a head
C．he has a mouth
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
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