2. 考研
  3. The first______in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.

The first______in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.

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问题 The first______in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.
选项 A、intervals
B、breaks
C、stages
D、periods
答案C
解析 stage意为“阶段，时期”；interval意为“间隔，间歇”；break意为“(课间或_丁间)休息时间”；period意为“一段时间，时期”。
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