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[单项选择]Stone tools, animal bones and an incised mammoth tusk found in Russia’s frigid far north have provided what archaeologists say is the first evidence that modem humans or Neanderthals lived in the Arctic more than 30,000 years ago, at least 15, 000 years earlier than previously thought.
A team of Russian and Norwegian archaeologists, describing the discovery in today’s issue of the journal Nature, said the campsite, at Mamontovaya Kurya, on the Ural River at the Arctic Circle, was the"oldest documented evidence for human presence at this high latitude".Digging in the bed of an old river channel close to the Ural Mountains, the team uncovered 123 mammal bones, including horse, reindeer and wolf."The most important find, "they said, was a four-foot mammoth tusk with grooves made by chopping with a sharp stone edge, "unequivocally the work of humans".The tusk was carbon-dated at about 36, 600 years old.Plant remains found among the artifacts were dated at 30, 000 to 31, 000 years.A. Moderate temperature, relatively dry and ice-free.
B. Extremely cold, relatively dry and ice-free.
C. Extremely cold, plenty of raining and ice-free.
D. Extremely cold, relatively dry and ice froste

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