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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大学英语六级

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

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