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  3. When was man’s life changed in many ways? What is the article mainly about?

When was man’s life changed in many ways? What is the article mainly about?

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问题 When was man’s life changed in many ways?
What is the article mainly about?
选项 A、Fire and metals are both very important.
B、The science of preparing metal for use began before the use of fire.
C、Tools, weapon and decorations can only be made from metals.
D、Fire has been playing an very important part in their life and work since human beings mastered its use.
答案D
解析 全文一直在讲：自人类掌握火的用法以来，火在人类工作和生活中的作用，所以选项[D]为正确答案。
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