# 题目内容

Which of the following can be inferred from the passage about methanogens?
• AMethanogens must have appeared on Earth later than 2.3 billion years ago.
• BMethanogens must have been much more prevalent in some regions of the early Earth than in others.
• CMethanogens produce a greenhouse gas that is more susceptible to destruction by the Suns ultraviolent rays than is ammonia.
• DMethanogens could not have thrived in early Earths atmosphere without the presence of ammonia.
• EMethanogens would have had a less significant effect on early Earth`s atmosphere if they had evolved after the appearance of cyanobacteria.

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