Gap Fill - Factor X - Level 1


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  • After this paragraph, go to Paragraph 2.

   bacteria      common      deadly      ground      infectious      little      professor      these      thousands      unknown   

Paragraph 1

Old under the ground could contain many diseases. The bacteria have been trapped in permafrost for of years. Permafrost is long-frozen . It is in mountains and near the North and South Poles. It is melting because of climate change. This could release , harmful viruses. Scientists are calling 'Factor X'. An diseases said we know about Factor X.

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