What is the passage mainly about? [br] According to Michael Symonds, one factor

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问题 What is the passage mainly about? [br] According to Michael Symonds, one factor contributing to the obesity epidemic is decrease of ______

选项

答案 family size

解析根据题干的人名Michael Symonds可定位至第六个小标题下的第三段，再根据题干空格前的词decrease of准确定位至该段第二句开头的as family size decrease，family size就是答案。

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