What is the main subject of the passage? It is difficult to trace the history of certain ancient beads because they ______.

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问题 What is the main subject of the passage?
It is difficult to trace the history of certain ancient beads because they ______.

选项 A、are small in size
B、have been buried underground
C、have been moved from their original locations
D、are frequently lost

答案C

解析
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