2. 外语
  3. According to the discoveries of the astronomers, when did galaxies form? What happened when the ionized hydrogen became more tr

According to the discoveries of the astronomers, when did galaxies form? What happened when the ionized hydrogen became more tr

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问题 According to the discoveries of the astronomers, when did galaxies form?
What happened when the ionized hydrogen became more transparent?
选项
答案The galaxies’ light can pass through.
解析 根据题干中的关键词ionized hydrogen和more transparent定位到倒数第三段最后一句，可知电离氢变得更为透明，这使得星系的光线可以从中穿过。
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