2. 外语
  3. According to the discoveries of the astronomers, when did galaxies form? According to the passage, the "hierarchical" theory of

According to the discoveries of the astronomers, when did galaxies form? According to the passage, the "hierarchical" theory of

admin2009-08-19  18
问题 According to the discoveries of the astronomers, when did galaxies form?
According to the passage, the "hierarchical" theory of galaxy formation suggests that big, bright galaxies formed as ______.
选项
答案smaller galaxies collided and merged
解析 根据题干中的关键词“hierarchical”theory定位到最后一段，可得答案。
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