【单选题】 The first ______ in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.
A.intervals
B.breaks
C.stages
D.periods
网考网参考答案:C
网考网解析:
[注释] 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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