2. 外语
  3. What topic is the passage mainly concerned with? What are the two mysteries that have remained unknown to the modern people?

What topic is the passage mainly concerned with? What are the two mysteries that have remained unknown to the modern people?

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问题 What topic is the passage mainly concerned with?
What are the two mysteries that have remained unknown to the modern people?
选项
答案When man began to use fire and language．
解析
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大学英语六级

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