单选题：The purpose of the research on twins by Raiha and colleagues

题目分类：卫生类
题目类型：单选题
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题目内容：

The purpose of the research on twins by Raiha and colleagues was to examine A．the relationship between family member
B．the effect of pain-releasing medicine
C．the roles of genetic and environmental factors in the origin of ulce
D．the symptoms of ulce

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