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
单项选择题
What kind of jobs have been moved to countries with lower labor costs
A．Factory production.
B．Computer programming.
C．Labor-intensive jobs.
D．All of the above.
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