单选题：The Molecular Genealogy Research Group is building a databa

题目分类：成人英语三级
题目类型：单选题
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题目内容：

The Molecular Genealogy Research Group is building a database for the purpose of __________. A．offering assistance in working out genealogy-related problems
B．solving many issues without relying on traditional written records
C．providing a pedigree chart of at least four generations in the world
D．confirming the assumption that all individuals are of the same origin

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