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考研英语阅读理解：生命进化历史免费下载，
life had arisen and we have fossils of microscopic bacterialike creatures to prove it. (21) ————. Nobody knows what happened, but theorists agree that the key was the spontaneous arising of selfreplicating entities, i.e. something equivalent to “genes” in the general sense.
The atmosphere
考研英语阅读理解：生命进化历史
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