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"(课间或工间)休息时间"；period意为"一段时间，时期"。

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GCT工程硕士（英语）

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