AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent-查字典考试网

AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent

A、whollyoperational
B、entirelyserviceable
C、fullyreliable
D、completelysafe

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