单选题：In what way is obesity contagious and epidemic?

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题目类型：单选题
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题目内容：

In what way is obesity contagious and epidemic? A．Social networks let the obesity spread rapidly.
B．1ndividuals have genetically determined ranges of weights.
C．Obesity can easily spread from one to another without any physical contact.
D．Obesity can spread rapidly and extensively by infection and affecting many individuals in an area or a population at the same time．

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，其中p为价格，Q为需求量，则下列_____为收入函

，其中p为价格，Q为需求量，则下列_____为收入函

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分类：卫生类题型：单选题