单项选择题
______ have an average of three children.
A．Pattern Ⅰ families
B．Pattern Ⅱ families
C．Pattern Ⅲ families
D．None of all
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单项选择题
All of the following statements about pattern Ⅱ children express differences EXCEPT ______.
A．they migrate for part of each year
B．they spend less time contributing to family income
C．they spend more months on school
D．their parents sometimes work at jobs rather than fanning
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