2. 外语
  3. Early fires were not caused by ______. According to the passage, we can infer that ______.

Early fires were not caused by ______. According to the passage, we can infer that ______.

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问题 Early fires were not caused by ______.
According to the passage, we can infer that ______.
选项 A、early fires were made by man
B、man did not fear the fire at first
C、man discovered iron much later than bronze
D、fire is still the master of man
答案C
解析 从最后一段可以得知，因为从铁矿石里炼出铁很不容易，所以人类先发现了青铜。
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