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1. A fossil that has one fourth the normal proportion of carbon-14 to carbon-12 is approximately _____years? (Carbon-14 half life is about 5,700 years)
(A) 1,350
(B) 2,750
(C) 11,400
(D) 16,800
(E) 22,400

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1. A fossil that has one fourth the norm..-阿摩線上測驗