单项选择题

When did the Neanderthals extinct

A．More than 30,000 years ago.
B．After 30,000 years ago.
C．Before about 35,000 years ago.
D．Some 13,000 to 14,000 years ago.
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单项选择题
Why the team believed that the four-foot mammoth tusk was the most important find
A．Because it was the longest tusk ever found.
B．Because there were signs left by human's tools on it.
C．Because there were grooves on it.
D．Because there are not any mammoth tusk all over the world.
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