How did people in the early Ice Age keep warm?A.By living in large groups.B.By using sand

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How did people in the early Ice Age keep warm?

A.By living in large groups.

B.By using sand as insulation.

C.By keeping fires burning constantly.

D.By facing their homes towards the south.

请帮忙给出正确答案和分析,谢谢!

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