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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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
Scientists do not know ________.
A．how children learn their own languages
B．when children begin to learn their own languages
C．why children learn their own languages
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