单项选择题

How old is the perfect age for a dog to be adopted to a human family

A．6 to 8 weeks.
B．Three months at most.
C．Six months at least.
D．One year old.
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单项选择题
A man’s mind is rather like______.
A．a machine
B．a camera
C．a photo
D．a dictionary
填空题
break
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