People did not suddenly learn to use fire, but did so slowly over time with coun

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问题 People did not suddenly learn to use fire, but did so slowly over time with countless advances offset by______ period.

选项

答案 A，F

解析 offset说明前后反义重复。空格与advances(进步)反义重复。recessive退步的，fertile肥沃的，accumulated增长的，contemplative沉思的，explosive爆炸的，regressive退步的。答案选AF。

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