2. 外语
  3. We need fire because it helps us _________. According to this passage, nobody knows for sure _________.

We need fire because it helps us _________. According to this passage, nobody knows for sure _________.

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问题 We need fire because it helps us _________.
According to this passage, nobody knows for sure _________.
选项 A、how people began to use fire
B、Why people began to use fire
C、how toMake a fireWithMatches
答案A
解析 该句正是文章第二段开头所表达的话。故本题答案为A。
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