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【单选题】
14C的半衰期为5730年，活体物质中14C和从考古遗址中得到羊毛织物碎片中14C衰变速率之比为1．35，则该羊毛织物试样存在的时间约为( )。A.
公元1950年
B.
公元前500年
C.
公元前5700年
D.
公元前10000年
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