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

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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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大学英语六级

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

大学英语六级

A—limitedliabilityJ—unfaircompetitionB—businessscopeK—wholesalerC—commercialchannelsL—uncollectibleaccountD—bu

Withnearly732,000monthlysubscribers,Stamps,com™istheleadingproviderofInternet-basedpostagesolutions.Stamps.comw

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