单项选择题


A．out
B．off
C．down
D．up
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单项选择题
A．Factory production.B．Computer programming.C．Labor-intensive jobs.D．All of the above.
A．Factory production.
B．Computer programming.
C．Labor-intensive jobs.
D．All of the above.
单项选择题
A．past experienceB．specialists’ ideasC．family conditionsD．common sence
A．past experience
B．specialists’ ideas
C．family conditions
D．common sence
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