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This is Scientific America's 60-Second Science, I'm Cynthia Graber. This'll just take a minute. Its hot to research life in extreme environments. There are organisms that thrive in boiling hot thermal vents and in toxic stews. These extremophiles, as

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Step by Step 3000 第2册 Unit8:Everybody can help the environment(4)

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Step by Step 3000 第二册

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average static load per waggon

be doubtful of

bothum

bred and born

callopistria nigrescens