单项选择题


A．amount
B．number
C．sum
D．total
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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
单项选择题
A．6 to 8 weeks.B．Three months at most.C．Six months at least.D．One year old.
A．6 to 8 weeks.
B．Three months at most.
C．Six months at least.
D．One year old.
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