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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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
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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