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  3. According to the discoveries of the astronomers, when did galaxies form? The comparative rarity of IOK-1 means that significant

According to the discoveries of the astronomers, when did galaxies form? The comparative rarity of IOK-1 means that significant

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问题 According to the discoveries of the astronomers, when did galaxies form?
The comparative rarity of IOK-1 means that significant changes must have occurred in the universe over the 60 million years that ______.
选项
答案separate the two epochs
解析 根据题干中的关键词comparative rarity和60 million years定位到倒数第六段，可知诸如IOK-1之类物体相对的稀有性表明，。在分割两个时代的六千万年间，宇宙一定有了重要的改变。
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