单选题：According to Dr．Nicholas A，Christakis，what is the explanatio

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题目内容：

According to Dr．Nicholas A，Christakis，what is the explanation for friends being the greatest influence? A．Friends usually spend a lot of time together．
B．Friends share similar eating habits．
C．Friends are more important than family members．
D．Friends affected each others’feelings of fatness．

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分类：卫生类题型：单选题