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  3. PASSAGE THREE Why did modern humans survive the successive volcanic eruptions?

PASSAGE THREE Why did modern humans survive the successive volcanic eruptions?

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问题 PASSAGE THREE
Why did modern humans survive the successive volcanic eruptions?
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答案Because of their fallback populations in Africa and Asia．
解析 为什么现代人类能经历了密集的火山爆发而幸存下来?文章第一段结尾处就指出“Modern humans，though，squeaked by，thanks to fallback populations in Africa and Asia，researchers say．”此处squeak by就表示“对付过去”，原因在于thanks to后面引出的原因“其在非洲和亚洲的广大人口储备”。
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