单项选择题

A．At the call box.
B．At the jewelry store.
C．From a machine.
D．From the purchaser.
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A．It learns to say by imitating what people say.B．It learns to say by imitating what people hear.C．It learns to say by thinking.D．It learns to say by seeing.
A．It learns to say by imitating what people say.
B．It learns to say by imitating what people hear.
C．It learns to say by thinking.
D．It learns to say by seeing.
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