Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
A、whollyoperationalC
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ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
TheeconomyofDallas,Texas,isstronganddiversified.
Alligatorsstillexistinsomeofthedank潮湿swampsandbayous小海湾ofAlabama'scoastalregions.
